English verb conjugation COULD INTERVENE

Regular verb: intervene - intervened - intervened

Affirmation

Simple form

I could intervene
you could intervene
he could intervene
we could intervene
you could intervene
they could intervene

V-ing form

I could be intervening
you could be intervening
he could be intervening
we could be intervening
you could be intervening
they could be intervening

Perfect

I could have intervened
you could have intervened
he could have intervened
we could have intervened
you could have intervened
they could have intervened

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I intervene?
could you intervene?
could he intervene?
could we intervene?
could you intervene?
could they intervene?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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