Go to bed early. (SUPPOSED)
Ask for permission to leave the exam early. (HAVE TO // MUSTN'T)
You’d better leave before there’s an argument. a) You should go now. b) You don’t need to go yet.
A
I wasn’t supposed to tell her about the party.a) I shouldn’t have told her about the party. b) I had to tell her about the party.
A
I'm worried about Eva. I SHOULD / MUST have told her the truth.
SHOULD
My parents had to explain what was happening. a) It was a good idea to explain. b) They were obliged to explain.
B
In most countries it’s forbidden to be married to more than one person. a) You mustn’t be married to more than one person. b) You needn’t be married to more than one person.
A
They have to discuss their problems or they will get worse. a) Perhaps they should discuss their problems. b) It’s important that they discuss their problems.
B
If we are going to be late, we ought /'d better call her.
'd better
You didn’t have to tell everyone what I’d said. a) It was unnecessary to tell everyone but you did. b) You were obliged to tell everyone.
A
He feels he ought to be honest. a) He told the truth. b) He’s going to tell the truth.
B
you didn't need / needn't have brought your laptop, we've got one here.
needn't
Do your homework. (OUGHT)
YOU OUGHT TO DO YOUR HOMEWORK
They wear a school uniform. (COMPULSORY)
IT IS COMPULSORY TO WEAR A SCHOOL UNIFORM
We had evidence but we couldn’t use it. a) We didn’t want to use the evidence. b) We weren’t permitted to use the evidence.
B