Conjugaison du verbe anglais COULD MASTER

I could master
you could master
he could master
we could master
you could master
they could master

I could be mastering
you could be mastering
he could be mastering
we could be mastering
you could be mastering
they could be mastering

I could have mastered
you could have mastered
he could have mastered
we could have mastered
you could have mastered
they could have mastered

I could have been mastering
you could have been mastering
he could have been mastering
we could have been mastering
you could have been mastering
they could have been mastering

I could not master
you could not master
he could not master
we could not master
you could not master
they could not master

I could not be mastering
you could not be mastering
he could not be mastering
we could not be mastering
you could not be mastering
they could not be mastering

I could not have mastered
you could not have mastered
he could not have mastered
we could not have mastered
you could not have mastered
they could not have mastered

I could not have been mastering
you could not have been mastering
he could not have been mastering
we could not have been mastering
you could not have been mastering
they could not have been mastering

could I master?
could you master?
could he master?
could we master?
could you master?
could they master?

could I be mastering?
could you be mastering?
could he be mastering?
could we be mastering?
could you be mastering?
could they be mastering?

could I have mastered?
could you have mastered?
could he have mastered?
could we have mastered?
could you have mastered?
could they have mastered?

could I have been mastering?
could you have been mastering?
could he have been mastering?
could we have been mastering?
could you have been mastering?
could they have been mastering?

could I not master?
could you not master?
could he not master?
could we not master?
could you not master?
could they not master?

could I not be mastering?
could you not be mastering?
could he not be mastering?
could we not be mastering?
could you not be mastering?
could they not be mastering?

could I not have mastered?
could you not have mastered?
could he not have mastered?
could we not have mastered?
could you not have mastered?
could they not have mastered?

could I not have been mastering?
could you not have been mastering?
could he not have been mastering?
could we not have been mastering?
could you not have been mastering?
could they not have been mastering?