an exam./go to bed late/You shouldn't/ the night before
You shouldn’t go to bed late the night before an exam.
shouldn't/ phone in class./ You/ use a mobile phone
You shouldn’t use a mobile phone in class.
friend if she's/ help your/got a problem?/Should you
Should you help your friend if she’s got a problem?
watch TV/ the same time./ and study at/ You shouldn't
You shouldn’t watch TV and study at the same time.
your parents/ always help/ at home./You should
You should always help your parents at home.