English verb conjugation COULD STRAIGHTEN

Regular verb: straighten - straightened - straightened

Affirmation

Simple form

I could straighten
you could straighten
he could straighten
we could straighten
you could straighten
they could straighten

V-ing form

I could be straightening
you could be straightening
he could be straightening
we could be straightening
you could be straightening
they could be straightening

Perfect

I could have straightened
you could have straightened
he could have straightened
we could have straightened
you could have straightened
they could have straightened

V-ing perfect

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

Negation

Simple form

I could not straighten
you could not straighten
he could not straighten
we could not straighten
you could not straighten
they could not straighten

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I straighten?
could you straighten?
could he straighten?
could we straighten?
could you straighten?
could they straighten?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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