Making sentences negative: don't, doesn't, isn't, can't, haven't
Subject + auxiliary + not + verb (or contracted: n't)
Already negative
Auxiliary + n't + subject + verb? (Didn't you go?)
💡 Contractions: do not → don't, does not → doesn't, did not → didn't, is not → isn't.
✓She doesn't like pizza.
✗She don't like pizza.
Third person singular uses 'doesn't'.
✓I didn't see him.
✗I didn't saw him.
Use base verb after didn't.
✓They aren't coming.
✗They doesn't coming.
Use 'aren't' with present continuous.