English verb conjugation COULD MAINTAIN

Regular verb: maintain - maintained - maintained

Affirmation

Simple form

I could maintain
you could maintain
he could maintain
we could maintain
you could maintain
they could maintain

V-ing form

I could be maintaining
you could be maintaining
he could be maintaining
we could be maintaining
you could be maintaining
they could be maintaining

Perfect

I could have maintained
you could have maintained
he could have maintained
we could have maintained
you could have maintained
they could have maintained

V-ing perfect

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

Negation

Simple form

I couldn't maintain
you couldn't maintain
he couldn't maintain
we couldn't maintain
you couldn't maintain
they couldn't maintain

V-ing form

I couldn't be maintaining
you couldn't be maintaining
he couldn't be maintaining
we couldn't be maintaining
you couldn't be maintaining
they couldn't be maintaining

Perfect

I couldn't have maintained
you couldn't have maintained
he couldn't have maintained
we couldn't have maintained
you couldn't have maintained
they couldn't have maintained

V-ing perfect

I couldn't have been maintaining
you couldn't have been maintaining
he couldn't have been maintaining
we couldn't have been maintaining
you couldn't have been maintaining
they couldn't have been maintaining

Interrogative form

Simple form

could I maintain?
could you maintain?
could he maintain?
could we maintain?
could you maintain?
could they maintain?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

couldn't I maintain?
couldn't you maintain?
couldn't he maintain?
couldn't we maintain?
couldn't you maintain?
couldn't they maintain?

V-ing form

couldn't I be maintaining?
couldn't you be maintaining?
couldn't he be maintaining?
couldn't we be maintaining?
couldn't you be maintaining?
couldn't they be maintaining?

Perfect

couldn't I have maintained?
couldn't you have maintained?
couldn't he have maintained?
couldn't we have maintained?
couldn't you have maintained?
couldn't they have maintained?

V-ing perfect

couldn't I have been maintaining?
couldn't you have been maintaining?
couldn't he have been maintaining?
couldn't we have been maintaining?
couldn't you have been maintaining?
couldn't they have been maintaining?

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