Thanks. It's because "heard ... whimper" is a catenative construction.
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future332 Could you please tell why there is no S at the end of whimper?He heard the dog whimper.Thanks.It's because "heard ... whimper" is a catenative construction. Verbs of perception, especially see and hear, are typically combined with the plain form of the following verb, forming a unit of two verbs.
EnglishmavenWe don't use the present tense form of "whimper" because it is not a verb in the sentence.