, see, hear , take either the plain form or the -ing form. Both are correct. saw him cross the street / saw him crossing the street heard them sing a song / heard them singing a song These are called catenative constructions.
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Verbs of perception,e.g., see, hear, take either the plain form or the -ing form. Both are correct.
saw him cross the street / saw him crossing the street
heard them sing a song / heard them singing a song
These are called catenative constructions. see and hear are called catenative verbs (and there are many others).
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