must constringe
Regular verb: constringe - constringed- constringed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must constringe
you must constringe
she must constringe
we must constringe
you must constringe
they must constringe 	I must be constringing
you must be constringing
she must be constringing
we must be constringing
you must be constringing
they must be constringing	I must have constringed
you must have constringed
she must have constringed
we must have constringed
you must have constringed
they must have constringed	I must have been constringing
you must have been constringing
she must have been constringing
we must have been constringing
you must have been constringing
they must have been constringing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not constringe
you must not constringe
she must not constringe
we must not constringe
you must not constringe
they must not constringe 	I must not be constringing
you must not be constringing
she must not be constringing
we must not be constringing
you must not be constringing
they must not be constringing	I must not have constringed
you must not have constringed
she must not have constringed
we must not have constringed
you must not have constringed
they must not have constringed	I must not have been constringing
you must not have been constringing
she must not have been constringing
we must not have been constringing
you must not have been constringing
they must not have been constringing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I constringe?
must you constringe?
must she constringe?
must we constringe?
must you constringe?
must they constringe? 	must I be constringing?
must you be constringing?
must she be constringing?
must we be constringing?
must you be constringing?
must they be constringing? 	must I have constringed?
must you have constringed?
must she have constringed?
must we have constringed?
must you have constringed?
must they have constringed? 	must I have been constringing?
must you have been constringing?
must she have been constringing?
must we have been constringing?
must you have been constringing?
must they have been constringing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not constringe?
must you not constringe?
must she not constringe?
must we not constringe?
must you not constringe?
must they not constringe? 	must I not be constringing?
must you not be constringing?
must she not be constringing?
must we not be constringing?
must you not be constringing?
must they not be constringing? 	must I not have constringed?
must you not have constringed?
must she not have constringed?
must we not have constringed?
must you not have constringed?
must they not have constringed? 	must I not have been constringing?
must you not have been constringing?
must she not have been constringing?
must we not have been constringing?
must you not have been constringing?
must they not have been constringing?