Level A1
Present Simple: Negative forms
Saying no in the present: I don't play, he doesn't play. After don't / doesn't the action word has no -s.
He doesn't like milk.
He is one person, so: does not, short doesn't. And like stays like: He doesn't like milk.
Forms
I / you / we / they → don't play— do not = don'the / she / it → doesn't play— the -s moves to the helper: doesdoesn't play · not doesn't plays— after don't / doesn't: no -s
A common mistake
Wrong: He doesn't plays football.
Right: He doesn't play football.
The -s is already in does, so play stays play: He doesn't play football.
More examples
We don't watch TV in the morning.
With we: don't watch.
My cat doesn't eat fish.
My cat is it, so: doesn't eat.