English verb conjugation COULD MASTER

Regular verb: master - mastered - mastered

Affirmation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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?

Interro-negative form

Simple form

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

V-ing form

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?

Perfect

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?

V-ing perfect

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?

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