English verb conjugation
COULD LENGTHEN LENGTHEN

Regular verb: lengthen lengthen - lengthen lengthened - lengthen lengthened

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form	V-ing form
I could lengthen lengthen you could lengthen lengthen he could lengthen lengthen we could lengthen lengthen you could lengthen lengthen they could lengthen lengthen	I could be lengthen lengthening you could be lengthen lengthening he could be lengthen lengthening we could be lengthen lengthening you could be lengthen lengthening they could be lengthen lengthening
Perfect	V-ing perfect
I could have lengthen lengthened you could have lengthen lengthened he could have lengthen lengthened we could have lengthen lengthened you could have lengthen lengthened they could have lengthen lengthened	I could have been lengthen lengthening you could have been lengthen lengthening he could have been lengthen lengthening we could have been lengthen lengthening you could have been lengthen lengthening they could have been lengthen lengthening

Negation

Simple form	V-ing form
I could not lengthen lengthen you could not lengthen lengthen he could not lengthen lengthen we could not lengthen lengthen you could not lengthen lengthen they could not lengthen lengthen	I could not be lengthen lengthening you could not be lengthen lengthening he could not be lengthen lengthening we could not be lengthen lengthening you could not be lengthen lengthening they could not be lengthen lengthening
Perfect	V-ing perfect
I could not have lengthen lengthened you could not have lengthen lengthened he could not have lengthen lengthened we could not have lengthen lengthened you could not have lengthen lengthened they could not have lengthen lengthened	I could not have been lengthen lengthening you could not have been lengthen lengthening he could not have been lengthen lengthening we could not have been lengthen lengthening you could not have been lengthen lengthening they could not have been lengthen lengthening

Interrogative form

Simple form	V-ing form
could I lengthen lengthen? could you lengthen lengthen? could he lengthen lengthen? could we lengthen lengthen? could you lengthen lengthen? could they lengthen lengthen?	could I be lengthen lengthening? could you be lengthen lengthening? could he be lengthen lengthening? could we be lengthen lengthening? could you be lengthen lengthening? could they be lengthen lengthening?
Perfect	V-ing perfect
could I have lengthen lengthened? could you have lengthen lengthened? could he have lengthen lengthened? could we have lengthen lengthened? could you have lengthen lengthened? could they have lengthen lengthened?	could I have been lengthen lengthening? could you have been lengthen lengthening? could he have been lengthen lengthening? could we have been lengthen lengthening? could you have been lengthen lengthening? could they have been lengthen lengthening?

Interro-negative form

Simple form	V-ing form
could I not lengthen lengthen? could you not lengthen lengthen? could he not lengthen lengthen? could we not lengthen lengthen? could you not lengthen lengthen? could they not lengthen lengthen?	could I not be lengthen lengthening? could you not be lengthen lengthening? could he not be lengthen lengthening? could we not be lengthen lengthening? could you not be lengthen lengthening? could they not be lengthen lengthening?
Perfect	V-ing perfect
could I not have lengthen lengthened? could you not have lengthen lengthened? could he not have lengthen lengthened? could we not have lengthen lengthened? could you not have lengthen lengthened? could they not have lengthen lengthened?	could I not have been lengthen lengthening? could you not have been lengthen lengthening? could he not have been lengthen lengthening? could we not have been lengthen lengthening? could you not have been lengthen lengthening? could they not have been lengthen lengthening?