‘Should’ is always used in present tense.
I should go.
Should I go?
I should not go.
Shouldn’t I go?
Where should I go?
When should I go?
Why should I go?
How should I go?
Students should learn seriously.
Should students learn seriously?
Students should not learn seriously.
Should not students learn seriously?
Where should students learn seriously?
When should students learn seriously?
Why should students learn seriously?
How should students learn seriously?
What should students learn seriously?
You should be honest with your work.
Should you be honest with your work?
You should not be honest with your work.
Should not you be honest with your work?
Where should you be honest with your work?
When should you be honest with your work?
Why should you be honest with your work?
How should you be honest with your work?
What should you be honest with?
Go over-