Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I shall lengthen lengthen you shall lengthen lengthen he shall lengthen lengthen we shall lengthen lengthen you shall lengthen lengthen they shall lengthen lengthen
V-ing form
I shall be lengthen lengthening you shall be lengthen lengthening he shall be lengthen lengthening we shall be lengthen lengthening you shall be lengthen lengthening they shall be lengthen lengthening
Perfect
I shall have lengthen lengthened you shall have lengthen lengthened he shall have lengthen lengthened we shall have lengthen lengthened you shall have lengthen lengthened they shall have lengthen lengthened
V-ing perfect
I shall have been lengthen lengthening you shall have been lengthen lengthening he shall have been lengthen lengthening we shall have been lengthen lengthening you shall have been lengthen lengthening they shall have been lengthen lengthening
Negation
Simple form
I shall not lengthen lengthen you shall not lengthen lengthen he shall not lengthen lengthen we shall not lengthen lengthen you shall not lengthen lengthen they shall not lengthen lengthen
V-ing form
I shall not be lengthen lengthening you shall not be lengthen lengthening he shall not be lengthen lengthening we shall not be lengthen lengthening you shall not be lengthen lengthening they shall not be lengthen lengthening
Perfect
I shall not have lengthen lengthened you shall not have lengthen lengthened he shall not have lengthen lengthened we shall not have lengthen lengthened you shall not have lengthen lengthened they shall not have lengthen lengthened
V-ing perfect
I shall not have been lengthen lengthening you shall not have been lengthen lengthening he shall not have been lengthen lengthening we shall not have been lengthen lengthening you shall not have been lengthen lengthening they shall not have been lengthen lengthening
Interrogative form
Simple form
shall I lengthen lengthen? shall you lengthen lengthen? shall he lengthen lengthen? shall we lengthen lengthen? shall you lengthen lengthen? shall they lengthen lengthen?
V-ing form
shall I be lengthen lengthening? shall you be lengthen lengthening? shall he be lengthen lengthening? shall we be lengthen lengthening? shall you be lengthen lengthening? shall they be lengthen lengthening?
Perfect
shall I have lengthen lengthened? shall you have lengthen lengthened? shall he have lengthen lengthened? shall we have lengthen lengthened? shall you have lengthen lengthened? shall they have lengthen lengthened?
V-ing perfect
shall I have been lengthen lengthening? shall you have been lengthen lengthening? shall he have been lengthen lengthening? shall we have been lengthen lengthening? shall you have been lengthen lengthening? shall they have been lengthen lengthening?
Interro-negative form
Simple form
shall I not lengthen lengthen? shall you not lengthen lengthen? shall he not lengthen lengthen? shall we not lengthen lengthen? shall you not lengthen lengthen? shall they not lengthen lengthen?
V-ing form
shall I not be lengthen lengthening? shall you not be lengthen lengthening? shall he not be lengthen lengthening? shall we not be lengthen lengthening? shall you not be lengthen lengthening? shall they not be lengthen lengthening?
Perfect
shall I not have lengthen lengthened? shall you not have lengthen lengthened? shall he not have lengthen lengthened? shall we not have lengthen lengthened? shall you not have lengthen lengthened? shall they not have lengthen lengthened?
V-ing perfect
shall I not have been lengthen lengthening? shall you not have been lengthen lengthening? shall he not have been lengthen lengthening? shall we not have been lengthen lengthening? shall you not have been lengthen lengthening? shall they not have been lengthen lengthening?