This is a simple explanation about should.

1. SHOULD – SHOULDN’T
Advice or
recommendations
By Ismael Ascencio Centa

2. We use should or shouldn’t to
give recommendations or advice

3. He should get a hair cut
a hair cut
should Verb (basic form)
get

4. She should go to a hairdresser.
to a hairdresser
should Verb (basic form)
go

5. He shouldn’t play video games
Play video games
Should + not Verb (basic form)

6. She is my girlfriend.
You _______________
Change girlfriend
Buy new glasses
Marry her.
ShouldShouldn’t

7. Trujillo is dangerous.
You …
walk alone.
take tico taxis.
be careful..
Should
Shouldn’t