We ought to listen.
She has to listen.
I will have to listen.
He had to speak French.
We were supposed to speak French.
I am supposed to work.
Alphonse should arrive at noon.
She ought to have looked at them.
They ought to know the answer. (masc.)
She will have to think.
We should have thought.
I would have refused.
I should have refused.
She would have left.
She should have left.
He owes me money.
We ought to answer her.
We ought to have answered her.
We will have left before noon.