why should I say "They cook" versus "They cooks"
Because that's how you form the 3rd-person plural of the Simple Present tense.
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Because that's how you form the 3rd-person plural of the Simple Present tense.
fold desk 354Why should I say "They cook" versus "They cooks"
You should say it because you want to blend in with other English speakers by saying things as they say them. If you say things like "They cooks" you'll sound like a fool in front of others, and you certainly don't want that to happen, do you?