It wasn’t necessary for Bill to wear a tie to the interview. Nobody else did. - HAVE - Bill ______ a tie to the interview as nobody else did.

CORRECT: You should of asked what the wages were before you accepted the position.

CORRECT: If you hadn’t been late, you mustn’t have been given the sack.

CORRECT: He mustn’t have gone home; his jacket is on the back of his chair.

You can’t / must have fi nished your work by now. Everyone else has fi nished.

If you had wanted a full-time job you shouldn’t / ought to have accepted a part-time job.

John mustn't / wouldn't have applied for the job if he had known it wasn’t permanent.

I wouldn't / should have asked the manager about doing overtime when he was here.

Terry can’t / needn’t have arrived yet, he only left two minutes ago!

I’m sure John was made redundant, because now he’s looking for a new job. - MUST - John redundant because now he’s looking for a new job.

You can't / must have had a hard day at work. You look really tired.

You should / can have listened to the lecturer; he was very good.