He has never seen his mother make a cake.
Why is make correct? I got corrected because I wrote makes.
Why isn't "He has never seen his mother makes a cake" a correct sentence?
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"He has never seen his mother make a cake" is a correct sentence.
Here make is an infinitive without to.
The infinitive is used without to after certain verbs like bid, let, make, see, hear, need, dare etc. (EnglishGrammar.org)
Infinitives come in two types: the to infinitive and the bare infinitive (infinitive without to). Either form of the infinitive is the base form of the verb, which does not inflect according to the tense or the number or person of the subject.