English verb conjugation
COULD CONSTRAIN

Regular verb: constrain - constrained - constrained

Affirmation

Simple form	V-ing form
I could constrain you could constrain she could constrain we could constrain you could constrain they could constrain	I could be constraining you could be constraining she could be constraining we could be constraining you could be constraining they could be constraining
Perfect	V-ing perfect
I could have constrained you could have constrained she could have constrained we could have constrained you could have constrained they could have constrained	I could have been constraining you could have been constraining she could have been constraining we could have been constraining you could have been constraining they could have been constraining

Negation

Simple form	V-ing form
I could not constrain you could not constrain she could not constrain we could not constrain you could not constrain they could not constrain	I could not be constraining you could not be constraining she could not be constraining we could not be constraining you could not be constraining they could not be constraining
Perfect	V-ing perfect
I could not have constrained you could not have constrained she could not have constrained we could not have constrained you could not have constrained they could not have constrained	I could not have been constraining you could not have been constraining she could not have been constraining we could not have been constraining you could not have been constraining they could not have been constraining

Interrogative form

Simple form	V-ing form
could I constrain? could you constrain? could she constrain? could we constrain? could you constrain? could they constrain?	could I be constraining? could you be constraining? could she be constraining? could we be constraining? could you be constraining? could they be constraining?
Perfect	V-ing perfect
could I have constrained? could you have constrained? could she have constrained? could we have constrained? could you have constrained? could they have constrained?	could I have been constraining? could you have been constraining? could she have been constraining? could we have been constraining? could you have been constraining? could they have been constraining?

Interro-negative form

Simple form	V-ing form
could I not constrain? could you not constrain? could she not constrain? could we not constrain? could you not constrain? could they not constrain?	could I not be constraining? could you not be constraining? could she not be constraining? could we not be constraining? could you not be constraining? could they not be constraining?
Perfect	V-ing perfect
could I not have constrained? could you not have constrained? could she not have constrained? could we not have constrained? could you not have constrained? could they not have constrained?	could I not have been constraining? could you not have been constraining? could she not have been constraining? could we not have been constraining? could you not have been constraining? could they not have been constraining?