present participle - definition and synonyms

noun [countable] linguistics 

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singularpresent participle
pluralpresent participles
  1. in English, the ‘-ing’ form of a verb, that is used for forming the ‘continuouspresent and past, and as a noun or noun modifier. For example in the sentence ‘They were behaving in a threatening manner’, ‘behaving’ and ‘threatening’ are present participles.