English verb conjugation COULD HEIGHTEN

Regular verb: heighten - heightened - heightened

Affirmation

Simple form

I could heighten
you could heighten
he could heighten
we could heighten
you could heighten
they could heighten

V-ing form

I could be heightening
you could be heightening
he could be heightening
we could be heightening
you could be heightening
they could be heightening

Perfect

I could have heightened
you could have heightened
he could have heightened
we could have heightened
you could have heightened
they could have heightened

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I heighten?
could you heighten?
could he heighten?
could we heighten?
could you heighten?
could they heighten?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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