To be able to
Pouvoir
To have to
Devoir
To want to
Vouloir
It is necessary to
Il faut
I can
Je peux
You (informal) can
Tu peux
He can
Il peut
She can
Elle peut
We can
Nous pouvons
You (formal) can
Vous pouvez
They can
Ils/elles peuvent
I could (perfect tense)
J’ai pu
I could (imperfect)
Je pouvais
I will be able to
Je pourrai
I would be able to
Je pourrais
I must
Je dois
You (informal) must
Tu dois
He must
Il doit
We must
Nous devons
You (formal) must
Vous devez
They must
Ils/elles doivent
I had to (perfect)
J’ai dû
I had to (imperfect)
Je devais
I will have to
Je devrai