I should've declined.

Source: Tatoeba

You should've turned left.

You should have turned left.

Source: Tatoeba

I should've asked.

Source: Tatoeba

He should have been more careful.

Source: Tatoeba

You should have seen it.

Source: Tatoeba

You should have known better.

Source: Tatoeba

You should have done so.

Source: Tatoeba

You should have come earlier.

Source: Tatoeba

Tom should've obeyed the rules.

Source: Tatoeba

I should have asked Tom to help.

Source: Tatoeba

He should have been a lawyer.

Source: Tatoeba

You should have studied harder.

Source: Tatoeba

You should have accepted his advice.

Source: Tatoeba

You should have done it earlier. It cannot be helped now.

You should've done it earlier. It can't be helped now.

You should have done it earlier. It can't be helped now.

Source: Tatoeba