must unchain
Regular verb: unchain - unchained- unchained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must unchain
you must unchain
she must unchain
we must unchain
you must unchain
they must unchain 	I must be unchaining
you must be unchaining
she must be unchaining
we must be unchaining
you must be unchaining
they must be unchaining	I must have unchained
you must have unchained
she must have unchained
we must have unchained
you must have unchained
they must have unchained	I must have been unchaining
you must have been unchaining
she must have been unchaining
we must have been unchaining
you must have been unchaining
they must have been unchaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not unchain
you must not unchain
she must not unchain
we must not unchain
you must not unchain
they must not unchain 	I must not be unchaining
you must not be unchaining
she must not be unchaining
we must not be unchaining
you must not be unchaining
they must not be unchaining	I must not have unchained
you must not have unchained
she must not have unchained
we must not have unchained
you must not have unchained
they must not have unchained	I must not have been unchaining
you must not have been unchaining
she must not have been unchaining
we must not have been unchaining
you must not have been unchaining
they must not have been unchaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I unchain?
must you unchain?
must she unchain?
must we unchain?
must you unchain?
must they unchain? 	must I be unchaining?
must you be unchaining?
must she be unchaining?
must we be unchaining?
must you be unchaining?
must they be unchaining? 	must I have unchained?
must you have unchained?
must she have unchained?
must we have unchained?
must you have unchained?
must they have unchained? 	must I have been unchaining?
must you have been unchaining?
must she have been unchaining?
must we have been unchaining?
must you have been unchaining?
must they have been unchaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not unchain?
must you not unchain?
must she not unchain?
must we not unchain?
must you not unchain?
must they not unchain? 	must I not be unchaining?
must you not be unchaining?
must she not be unchaining?
must we not be unchaining?
must you not be unchaining?
must they not be unchaining? 	must I not have unchained?
must you not have unchained?
must she not have unchained?
must we not have unchained?
must you not have unchained?
must they not have unchained? 	must I not have been unchaining?
must you not have been unchaining?
must she not have been unchaining?
must we not have been unchaining?
must you not have been unchaining?
must they not have been unchaining?