English verb conjugation COULD MASTER

Regular verb: master - mastered - mastered

Affirmation

Simple form

I could master
you could master
she could master
we could master
you could master
they could master

V-ing form

I could be mastering
you could be mastering
she could be mastering
we could be mastering
you could be mastering
they could be mastering

Perfect

I could have mastered
you could have mastered
she 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
she could have been mastering
we could have been mastering
you could have been mastering
they could have been mastering

Negation

Simple form

I couldn't master
you couldn't master
she couldn't master
we couldn't master
you couldn't master
they couldn't master

V-ing form

I couldn't be mastering
you couldn't be mastering
she couldn't be mastering
we couldn't be mastering
you couldn't be mastering
they couldn't be mastering

Perfect

I couldn't have mastered
you couldn't have mastered
she couldn't have mastered
we couldn't have mastered
you couldn't have mastered
they couldn't have mastered

V-ing perfect

I couldn't have been mastering
you couldn't have been mastering
she couldn't have been mastering
we couldn't have been mastering
you couldn't have been mastering
they couldn't have been mastering

Interrogative form

Simple form

could I master?
could you master?
could she master?
could we master?
could you master?
could they master?

V-ing form

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

Perfect

could I have mastered?
could you have mastered?
could she 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 she have been mastering?
could we have been mastering?
could you have been mastering?
could they have been mastering?

Interro-negative form

Simple form

couldn't I master?
couldn't you master?
couldn't she master?
couldn't we master?
couldn't you master?
couldn't they master?

V-ing form

couldn't I be mastering?
couldn't you be mastering?
couldn't she be mastering?
couldn't we be mastering?
couldn't you be mastering?
couldn't they be mastering?

Perfect

couldn't I have mastered?
couldn't you have mastered?
couldn't she have mastered?
couldn't we have mastered?
couldn't you have mastered?
couldn't they have mastered?

V-ing perfect

couldn't I have been mastering?
couldn't you have been mastering?
couldn't she have been mastering?
couldn't we have been mastering?
couldn't you have been mastering?
couldn't they have been mastering?

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