Introduction
Transitions questions fall under the Expression of Ideas domain, which accounts for roughly 20% of Reading and Writing section questions. Within that domain, the Transitions skill asks you to pick the word or phrase that best signals the logical relationship between two pieces of information. This note zeroes in on one specific relationship: cause, effect, and conclusion — the family that includes therefore, thus, consequently, as a result, and hence. You must not only know what these words mean but also recognize whether the passage actually sets up that relationship — because the SAT will tempt you to use a cause-effect word when the sentences are merely continuing the same idea.
Core Concept
A cause-effect or conclusion transition tells the reader: "What I just said logically produces — or allows us to logically infer — what I am about to say." The relationship is directional and necessary: Sentence A is the cause or premise; Sentence B is the effect or conclusion drawn from it.
The test: Ask yourself — "Would a reasonable person say because Sentence A is true, Sentence B follows?" If yes, a cause-effect transition fits. If Sentence B just adds more detail, lists another feature, or shifts to a new aspect of the same topic without a logical chain, a cause-effect word creates a false relationship.
Example of a real consequence: The bridge was structurally unsound. Therefore, the city closed it to traffic. Why it works: The closure is the direct, logical result of the structural problem.
Example of mere continuation: The bridge was built in 1887. Therefore, it features ornate ironwork typical of Victorian design. Why it fails: The ironwork is an additional fact about the bridge, not a result of the build year. A continuation word like additionally or no transition at all would be correct.
The key insight: cause-effect words promise a logical arrow (→). If no arrow exists, the word is wrong — regardless of whether the second sentence is true.
Key Rules & Signals
| Transition | Register/Tone | Interchangeable With | Watch-Out |
|---|---|---|---|
| therefore | Neutral, formal | thus, consequently | Most common on the SAT; safest general-purpose choice |
| thus | Formal, concise | therefore | Often seen in scientific/academic contexts |
| consequently | Formal | therefore, as a result | Implies a significant or serious outcome |
| as a result | Neutral, slightly informal | consequently | Phrase (not a single word); must match sentence grammar |
| hence | Formal, slightly archaic | therefore | Rare on the SAT; watch for it in humanities passages |
Decision criteria — use a cause-effect transition ONLY when ALL three conditions hold:
- A cause or premise exists in the preceding sentence (or passage).
- The new sentence is a direct effect, conclusion, or inference from that cause/premise.
- Removing the transition and asking "why?" or "so what?" points back to the previous sentence as the answer.
Red-flag patterns that signal a wrong cause-effect word:
- The second sentence adds a contrasting idea → use a contrast word instead (however, nevertheless).
- The second sentence adds another supporting detail → use an addition word (furthermore, additionally).
- The second sentence continues a time sequence → use a sequence word (then, subsequently).
- The two sentences share a topic but no logical arrow connects them.
Worked Examples
Example 1
Researchers studying sleep deprivation in adolescents found that students who slept fewer than seven hours per night scored significantly lower on standardized memory tests than their well-rested peers. _______, health professionals increasingly recommend that schools delay start times to allow teenagers additional sleep.
Question: Which choice most effectively completes the text?
- A) In contrast,
- B) Consequently,
- C) For instance,
- D) Meanwhile,
Step-by-step reasoning:
Predict first: Sentence 1 is a finding (a cause/premise): sleep deprivation harms memory. Sentence 2 is a recommendation that directly follows from that finding. A logical arrow exists: because sleep deprivation harms memory, professionals recommend later start times. A cause-effect transition is needed.
Evaluate each option:
- A) In contrast — Signals opposition or difference. The recommendation does not oppose the finding; it flows from it. Fails because no contrast relationship exists.
- B) Consequently — Signals that the recommendation is a direct result of the research finding. The logical arrow is clear and real. ✓ Correct.
- C) For instance — Signals that Sentence 2 is an example of Sentence 1. The recommendation is not an example of sleep deprivation harming memory; it is a response to that fact. Fails because the relationship is not exemplification.
- D) Meanwhile — Signals simultaneous events occurring in parallel, with no causal link. Fails because the sentences are not describing two concurrent, independent events.
Answer: B
Example 2
The Amazon rainforest contains an estimated 10% of all species on Earth. It also absorbs vast quantities of atmospheric carbon dioxide, playing a critical role in regulating the global climate. _______, deforestation in the region has accelerated sharply over the past two decades, driven by agricultural expansion and logging.
Question: Which choice most effectively completes the text?
- A) Therefore,
- B) Similarly,
- C) However,
- D) As a result,
Step-by-step reasoning:
Predict first: Sentences 1–2 establish the Amazon's enormous ecological value (biodiversity + carbon absorption). Sentence 3 introduces deforestation — which is not caused by the Amazon's value; if anything, it runs counter to that value. The relationship between the second and third sentences is contrast, not consequence.
Evaluate each option:
- A) Therefore — Would claim that deforestation is a logical result of the Amazon's ecological importance. That is nonsensical: the forest's value does not cause its own destruction. Fails because the logical arrow does not exist.
- B) Similarly — Signals that the new sentence parallels the previous one. Deforestation does not parallel the Amazon's ecological role; they are opposing facts. Fails.
- C) However — Signals contrast or complication. The deforestation fact sharply contrasts with the positive picture in Sentences 1–2, creating the logical tension the author intends. ✓ Correct.
- D) As a result — Like therefore, this claims deforestation flows from the forest's importance. No such causal relationship exists in the passage. Fails for the same reason as A.
Answer: C
Trap alert: This example is designed to show that a cause-effect word can be the wrong answer even when the surrounding content sounds scientific. Always test the logical arrow — do not choose therefore just because the passage is about a complex topic.
Common Mistakes & Traps
| Mistake | Why Students Make It | How to Avoid It |
|---|---|---|
| Choosing therefore whenever two sentences are related | Any two adjacent sentences are related — that's basic paragraph logic | Test the arrow: does Sentence A cause or necessitate Sentence B? |
| Confusing for example contexts with as a result | Both introduce something that "follows" from the prior sentence | Ask: is it an instance/illustration, or a genuine outcome? |
| Ignoring register — choosing hence in a casual science passage | Hence looks formal and "smart" | All five words in this family are correct when the logic fits; register is a tiebreaker, not the first filter |
| Picking the contrast answer when a cause-effect word is correct | The test frequently pairs a real cause-effect setup with a tempting however | If the second sentence is bad news because of the first, that's cause-effect, not contrast |
| Treating "and"-type continuations as consequences | Two related facts are not automatically cause and effect | If you can replace the blank with additionally and it reads fine, the cause-effect word is wrong |
Practice Questions
Question 1
A 2023 study demonstrated that plants grown in soil enriched with mycorrhizal fungi absorbed phosphorus at nearly three times the rate of control plants. _______, the fungi-treated plants required significantly less synthetic fertilizer to achieve the same growth outcomes.
Which choice most effectively completes the text?
- A) In addition,
- B) Nevertheless,
- C) As a result,
- D) By contrast,
Show answer
Answer: C — As a result
The first sentence establishes that mycorrhizal fungi dramatically increase phosphorus absorption (cause/premise). The second sentence states that less fertilizer was needed (direct effect of the enhanced absorption). The logical arrow is real and clear.
- A) In addition — Would treat the reduced fertilizer need as a separate, parallel fact rather than a consequence of the enhanced absorption. This misrepresents the relationship; the two facts are causally linked, not merely co-listed.
- B) Nevertheless — Signals contrast or concession. There is no opposition between the two sentences; both describe positive outcomes of fungi treatment.
- D) By contrast — Signals direct opposition. Both sentences describe benefits of fungi; no contrast exists.
Question 2
The city of Lisbon sits on a series of hills overlooking the Tagus River estuary. Its historic neighborhoods feature narrow, winding streets lined with azulejo-tiled facades. _______, the city attracts millions of tourists each year.
Which choice most effectively completes the text?
- A) Therefore,
- B) However,
- C) For example,
- D) Furthermore,
Show answer
Answer: A — Therefore
Sentences 1–2 collectively describe Lisbon's striking geography and distinctive architectural character (cause/premise). The tourist influx in Sentence 3 is presented as the logical result of those appealing features. The arrow holds: because Lisbon has remarkable scenery and architecture, it draws millions of visitors.
- B) However — Signals contrast. Tourist popularity does not oppose Lisbon's physical and architectural character; it flows from it.
- C) For example — Would mean tourism is an example of Lisbon's hills or tile facades, which makes no logical sense.
- D) Furthermore — Would treat the tourist information as an additional, parallel fact rather than a consequence. While furthermore is grammatically possible, it obscures the causal relationship the passage sets up and misrepresents the logic. The passage's structure (two descriptive cause-sentences followed by an outcome sentence) signals consequence, not addition.
Question 3
Early vaccines against smallpox required physicians to make a small incision in the patient's skin and introduce a tiny amount of live cowpox material. The procedure was unfamiliar and sometimes painful. _______, many members of the public were initially reluctant to receive the treatment.
Which choice most effectively completes the text?
- A) Similarly,
- B) Thus,
- C) In other words,
- D) Regardless,
Show answer
Answer: B — Thus
Sentences 1–2 establish that the vaccination procedure was invasive and painful (cause). Sentence 3 states that public reluctance resulted from this (effect). The logical arrow is direct and clear.
- A) Similarly — Signals parallelism between two ideas. Public reluctance is not parallel to the procedure's painfulness; it is caused by it.
- C) In other words — Signals that the next sentence restates the previous one in different terms. Public reluctance is a new, consequential fact, not a restatement of the procedure's discomfort.
- D) Regardless — Signals that the upcoming information holds true despite the previous information — a concessive relationship. This would imply the public was reluctant in spite of the procedure being unfamiliar and painful, which contradicts the intended meaning.
Question 4
Marine biologists have confirmed that warming ocean temperatures bleach coral reefs by expelling the symbiotic algae that give corals both their color and their primary energy source. Without those algae, corals cannot produce sufficient nutrients to sustain their tissue. _______, prolonged bleaching events kill entire reef ecosystems within months.
Which choice most effectively completes the text?
- A) Meanwhile,
- B) Conversely,
- C) Consequently,
- D) Notably,
Show answer
Answer: C — Consequently
Sentences 1–2 build a causal chain: warming → bleaching → loss of algae → nutrient starvation. Sentence 3 delivers the ultimate consequence: reef death. Consequently correctly signals that the reef death is the end result of the chain described.
- A) Meanwhile — Signals two simultaneous but independent events. Reef death is not occurring in parallel with bleaching — it is caused by it.
- B) Conversely — Signals an opposite or reversed outcome. Reef death is the logical endpoint of the described process, not its opposite.
- D) Notably — Signals emphasis or special attention, not causation. It would suggest the reef death is merely a noteworthy additional fact rather than a logical outcome of nutrient starvation.
Connections
- Prerequisite — The Transition Word Taxonomy: This note assumes you already know the main categories of transitions (contrast, addition, sequence, cause-effect, etc.). If you are unsure which category a word belongs to, review that taxonomy note first.
- Sibling — Contrast and Concession Transitions: The most common wrong-answer trap on cause-effect questions is a contrast word (however, nevertheless). Review that note to keep the two families sharply distinct.
- Sibling — Addition, Sequence, and Emphasis Transitions: When two sentences are related but no logical arrow exists, an addition word (furthermore, additionally) or sequence word (subsequently) is often the correct choice — exactly the pattern this note teaches you to distinguish from genuine consequence.
- On test day: Transitions questions pair naturally with Rhetorical Synthesis and sentence-revision questions. The same "logical arrow" check applies: before choosing any transition, state in your own words what the two sentences say, then ask which relationship — contrast, addition, cause-effect — best describes how they connect.