Catch combines with different prepositions for different meanings. Catch on is a common phrasal verb, while catch in and catch by usually belong to larger expressions.
Catch on is a common phrasal verb meaning “understand” or “become popular.” Catch in usually appears in expressions such as catch someone in the act. Catch by is uncommon directly after catch and often introduces the means or agent in passive structures such as be caught by security.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Catch on can mean to understand something or for something to become popular.
Catch in commonly appears before a noun or activity to show the situation in which someone is discovered.
Caught by is usually part of a passive structure showing who or what captured or affected someone.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
Catch by is not normally used as an independent phrasal verb.
✕ I finally caught by what she meant. ✓ I finally caught on to what she meant.Catch in usually needs an object or situation.
✕ The guard caught in. ✓ The guard caught him in the act.Catch on usually refers to understanding or popularity, not grabbing someone.
✕ The officer caught on the thief. ✓ The officer caught the thief.Choose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
No. Catch on can stand alone or be followed by to plus a noun or idea, as in catch on to the plan.
Usually only in passive structures such as be caught by someone or something.
Not usually. In most cases, in introduces a situation, activity, or place after catch.
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