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English definition of “to”

to

preposition (INFINITIVE)   /tu, , /
used before a verb showing that it is in the infinitive: She agreed to help. I asked her to finish by Friday. I need to eat something. I’d love to visit New York. I want to go now. "To" followed by an infinitive is used after adjectives: It’s not likely to happen. I was afraid to tell her. "To" followed by an infinitive is used after nouns: He has the ability to do two things at once. "To" followed by an infinitive can begin a clause: To be honest (= Speaking honestly), I prefer the gray skirt. "To" followed by an infinitive can be used to express requests or orders: Is it possible to have tea instead? You’re not to go there by yourself. "To" followed by an infinitive is used after "how," "what," "when," "where," "whether," "which," "who," "whom," or "whose": I don’t know what to do. Can you tell me how to get there? "To" followed by an infinitive is used after "enough": I was close enough to touch him.
(Definition of to preposition (INFINITIVE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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