English verb conjugation COULD LENGTHEN

Regular verb: lengthen - lengthened - lengthened

Affirmation

Simple form

I could lengthen
you could lengthen
he could lengthen
we could lengthen
you could lengthen
they could lengthen

V-ing form

I could be lengthening
you could be lengthening
he could be lengthening
we could be lengthening
you could be lengthening
they could be lengthening

Perfect

I could have lengthened
you could have lengthened
he could have lengthened
we could have lengthened
you could have lengthened
they could have lengthened

V-ing perfect

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

Negation

Simple form

I could not lengthen
you could not lengthen
he could not lengthen
we could not lengthen
you could not lengthen
they could not lengthen

V-ing form

I could not be lengthening
you could not be lengthening
he could not be lengthening
we could not be lengthening
you could not be lengthening
they could not be lengthening

Perfect

I could not have lengthened
you could not have lengthened
he could not have lengthened
we could not have lengthened
you could not have lengthened
they could not have lengthened

V-ing perfect

I could not have been lengthening
you could not have been lengthening
he could not have been lengthening
we could not have been lengthening
you could not have been lengthening
they could not have been lengthening

Interrogative form

Simple form

could I lengthen?
could you lengthen?
could he lengthen?
could we lengthen?
could you lengthen?
could they lengthen?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

could I not be lengthening?
could you not be lengthening?
could he not be lengthening?
could we not be lengthening?
could you not be lengthening?
could they not be lengthening?

Perfect

could I not have lengthened?
could you not have lengthened?
could he not have lengthened?
could we not have lengthened?
could you not have lengthened?
could they not have lengthened?

V-ing perfect

could I not have been lengthening?
could you not have been lengthening?
could he not have been lengthening?
could we not have been lengthening?
could you not have been lengthening?
could they not have been lengthening?

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