|should||go to bed earlier.|
|shouldn't||watch so much TV.|
Should / Shouldn't
The modal verb should (negative: shouldn't) is used to make recommendations or give advice. When it is a good or not a good thing to do.
Should / shouldn't have the same form in all persons.
Should is followed by the infinitive without to.
- She should go to bed earlier. She goes to bed very late and she's always tired.
- It's a good film. You should go and see it.
- He shouldn't work so much.