He could study more before his exam.
He could have studied more before his exam.
You should go to the beach with us.
You should have gone to the beach with us.
She would prepare her work more carefully.
She would have prepared her work more carefully.
You may type your exercises.
You may have typed your exercises.
You might not say such things to him.
You might not have said such things to him.
We must call him.
We must have called him.
You could visit Hawaii.
You could have visited Hawaii.
She should be put in the beginner’s class.
She should have been put in the beginner’s class.
The letter would be sent air express.
The letter would have been sent air express.
You may speak to them in English.
You may have spoken to them in English.
They might buy a dog to protect the place.
They might have bought a dog to protect the place.
He must tell her about it.
He must have told her about it.
You could pay more attention to the grammar rules.
You could have paid more attention to the grammar rules.
We should go to the beach instead of spending all day at home.
We should have gone to the beach instead of spending all day at home.
You would put some money in the bank each week.
You would have put some money in the bank each week.
