Should
The same form for all persons
The form of should is the same for all persons:
I/you/he/she/it/we/you/they should see a specialist.
Should is a modal verb, and all modal verbs are followed by an infinitive (without to).
You should listen to me.
should not= shouldn’t
The negative form of should is should not or shouldn’t.
You should not be here./You shouldn’t be here.
Questions
To make questions, we use should + subject + infinitive. We don’t use the verb do to make questions.
Should we call him?
Use
Giving advice
We use should or shouldn’t to give somebody advice and to say what is or isn’t the right thing to do.
You look tired. You should have some rest.
He shouldn’t drive so fast. He’ll have an accident one day.
I think you should buy a new pair of shoes for the party.
I think we should go home; it’s very late.
Note that in a negative sentence, we often say I don’t think … should … (NOT I think … shouldn’t …)
I don’t think you should call her now; she’s very upset.
We often say Do you think … should … to ask for advice.
Do you think I should look for another apartment?