ACT inferences strategies
ACT Reading includes inference questions across the four passages in the 35-minute, 40-question section. Inference questions ask what follows from the passage, not what the passage states directly. These strategies cover distinguishing an inference from a restatement, requiring every answer to follow from the passage, and the trap of choosing an answer that is true in the real world but not supported by the text.
The core principle
An inference is a conclusion that must be true if the passage is true. It is not a guess, a prediction, or an opinion. It is not what the passage says directly (that is a detail question). It is what the passage implies so strongly that no other conclusion is reasonable. If the passage says "the factory reduced its emissions by 40% after installing the new filtration system, but the surrounding air quality improved by only 5%," a valid inference is that factors other than the factory contribute to the air pollution. An invalid inference is that the factory is the main cause of air pollution in the area, because the passage does not say that. The test for a valid inference is: could the passage be true and this answer be false? If yes, the answer is not a valid inference.
The most common trap
Choosing an answer that is true in the real world but not supported by the passage
The passage discusses a scientist who studied the effects of sleep deprivation. One answer choice states that sleep deprivation impairs memory, which is true in the real world. But the passage only discusses the scientist's work on reaction time, not memory. The answer is wrong because the passage does not support it. The test writers include real-world-true answers because they know students fill gaps with their own knowledge. The correct inference must follow from the passage alone. If the passage does not mention memory, no answer about memory is a valid inference, regardless of its real-world truth.
Step-by-step strategy
When to use: any question that uses the words "implies," "suggests," "can be inferred," or "most likely."
- 1Read the question stem and identify the part of the passage it refers to. Return to that section and reread it.
- 2State what the passage says in your own words. Identify the logical next step: what must be true if the passage is true?
- 3Test each answer choice: could the passage be true and this answer be false? If yes, eliminate it. The correct answer cannot be false if the passage is true.
- 4Eliminate any answer that goes beyond what the passage states. An inference that requires outside knowledge is not a valid inference.
- 5Choose the most conservative answer. The correct inference is the one that follows most directly from the passage, not the one that is the most interesting or the most specific.
When not to use: when the question asks for a directly stated detail rather than a conclusion. Use the detail retrieval strategy instead.
Related pages
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