1
You should to see a doctor.
You should see a doctor.
She should studies more.
She should study more.
Should is a modal verb. After should, use the infinitive without to or -s: ‘should see’, ‘should study’, ‘should go’.
2
Do I should call him now?
Should I call him now?
You don’t should worry about it.
You shouldn’t worry about it.
Do not use do, does, don’t or doesn’t with should.
In questions, put should before the subject: ‘Should I call him?’ ‘Should she come with us?’
In negative sentences, use should not or shouldn’t: ‘You shouldn’t worry.’ ‘He shouldn’t drive so fast.’
See MODAL VERBS
3
You should better start studying now if you want to pass the exam.
You should start studying now if you want to pass the exam.
You had better start studying now if you want to pass the exam.
Use should or had better to give advice. Do not use should better.
Use should for normal advice: ‘You should study more.’
Had better is stronger and often suggests that something bad will happen if the advice is not followed: ‘You’d better hurry or you’ll miss the train.’
4
I should have went to bed earlier last night.
I should have gone to bed earlier last night.
Use should have + past participle to say that something was a good idea in the past, but it did not happen: ‘You should have called me.’
Gone is the past participle of go. After should have, use gone, not went.