must unclasp
Regular verb: unclasp - unclasped- unclasped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must unclasp
you must unclasp
she must unclasp
we must unclasp
you must unclasp
they must unclasp 	I must be unclasping
you must be unclasping
she must be unclasping
we must be unclasping
you must be unclasping
they must be unclasping	I must have unclasped
you must have unclasped
she must have unclasped
we must have unclasped
you must have unclasped
they must have unclasped	I must have been unclasping
you must have been unclasping
she must have been unclasping
we must have been unclasping
you must have been unclasping
they must have been unclasping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not unclasp
you must not unclasp
she must not unclasp
we must not unclasp
you must not unclasp
they must not unclasp 	I must not be unclasping
you must not be unclasping
she must not be unclasping
we must not be unclasping
you must not be unclasping
they must not be unclasping	I must not have unclasped
you must not have unclasped
she must not have unclasped
we must not have unclasped
you must not have unclasped
they must not have unclasped	I must not have been unclasping
you must not have been unclasping
she must not have been unclasping
we must not have been unclasping
you must not have been unclasping
they must not have been unclasping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I unclasp?
must you unclasp?
must she unclasp?
must we unclasp?
must you unclasp?
must they unclasp? 	must I be unclasping?
must you be unclasping?
must she be unclasping?
must we be unclasping?
must you be unclasping?
must they be unclasping? 	must I have unclasped?
must you have unclasped?
must she have unclasped?
must we have unclasped?
must you have unclasped?
must they have unclasped? 	must I have been unclasping?
must you have been unclasping?
must she have been unclasping?
must we have been unclasping?
must you have been unclasping?
must they have been unclasping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not unclasp?
must you not unclasp?
must she not unclasp?
must we not unclasp?
must you not unclasp?
must they not unclasp? 	must I not be unclasping?
must you not be unclasping?
must she not be unclasping?
must we not be unclasping?
must you not be unclasping?
must they not be unclasping? 	must I not have unclasped?
must you not have unclasped?
must she not have unclasped?
must we not have unclasped?
must you not have unclasped?
must they not have unclasped? 	must I not have been unclasping?
must you not have been unclasping?
must she not have been unclasping?
must we not have been unclasping?
must you not have been unclasping?
must they not have been unclasping?