I think you should see a doctor.
If you're annoyed with him, you should tell him.
You should change trains at Peterborough if you're going to Newcastle.
You should wear old clothes because we will get dirty. (Key English Test; A2; German)
"Should I apologize to him?"
Where should we meet tonight?
There should be an investigation into the cause of the disaster.
I should have written to her but I haven't had any time.
It's getting cold in here. Should I turn the heat up?
Should I call the police? (Preliminary English Test; B1; Portuguese)
My dry cleaning should be ready this afternoon.
If you follow these directions, you shouldn’t have any trouble finding our house.
I wonder what's happened to Annie. She should be here by now.
That should be enough food for five people.
I have invite[d] all his friends, [so] we should be 28 people. (Preliminary English Test; B1; French)
He wants me to give him my old car, but why should I?
Why shouldn't she get a new car if she wants one?
And personally I say "why should I read something in a book which I can watch on TV?" (First Certificate in English; B2; Greek)