A detective spends the last page of the novel doing something small: saying out loud the sentence all the clues already point to. Nothing new gets added. The butler’s muddy boots, the stopped clock, the unlatched window — each was on the table for chapters. The detective just states the one conclusion they force.
An SAT inference question asks for that sentence. It hands you a short passage, removes the final line, and gives you four ways to complete it. The right choice is the conclusion the text has already earned. The wrong ones are statements that sound reasonable but sit a step past the evidence.
The one question to ask
For each choice, ask whether the passage forces it, not whether it allows it. A choice can be true in the real world, agreeable, even likely, and still be wrong here — the only test is whether the sentences on the page guarantee it.
- Find the thread. Most of these passages run on a single logical turn: a contrast (“earlier studies assumed X; the new data show Y”) or a cause (“the enzyme breaks down at high heat”). Locate that turn.
- Say the conclusion yourself first. Before reading the choices, finish the thought in your own words. A blank you can fill from the text is a blank you won’t get baited on.
- Match to the choice that says only that. The answer restates your conclusion. A choice that adds a new reason, a prediction, or a comparison the passage never made is out.
What turns them hard
Easy inference items keep both halves of the logic in one sentence. Hard ones split the premises apart — a fact stated early, a qualifying detail buried late — and the valid conclusion needs both. A passage notes that a metal conducts heat well, then, three sentences on, that the device must stay cool to work. The inference lives in the join: this metal is a poor choice for that part. The traps take one half and run: they restate the early fact, or extend the late one into a claim the passage never supports.
Treat every choice as a suspect claiming an alibi. The passage is your only witness. If it doesn’t vouch for the claim directly, the claim walks.
Common questions
What is an inference question on the Digital SAT?
A short passage ends with a blank, and you choose the sentence that logically completes it. The correct answer is the conclusion the passage guarantees — not a plausible guess or a real-world fact the text never establishes.
How is an inference different from the main idea?
A main-idea question asks what the passage already states as its point. An inference asks for the unstated conclusion the stated facts force you to reach.