English verb conjugation
CAN CONSTRAIN

Regular verb: constrain - constrained - constrained

Affirmation

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

Negation

Simple form	V-ing form
I cannot constrain you cannot constrain he cannot constrain we cannot constrain you cannot constrain they cannot constrain	I cannot be constraining you cannot be constraining he cannot be constraining we cannot be constraining you cannot be constraining they cannot be constraining
Perfect	V-ing perfect
I cannot have constrained you cannot have constrained he cannot have constrained we cannot have constrained you cannot have constrained they cannot have constrained	I cannot have been constraining you cannot have been constraining he cannot have been constraining we cannot have been constraining you cannot have been constraining they cannot have been constraining

Interrogative form

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

Interro-negative form

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