must stridulate
Regular verb: stridulate - stridulated- stridulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must stridulate
you must stridulate
she must stridulate
we must stridulate
you must stridulate
they must stridulate 	I must be stridulating
you must be stridulating
she must be stridulating
we must be stridulating
you must be stridulating
they must be stridulating	I must have stridulated
you must have stridulated
she must have stridulated
we must have stridulated
you must have stridulated
they must have stridulated	I must have been stridulating
you must have been stridulating
she must have been stridulating
we must have been stridulating
you must have been stridulating
they must have been stridulating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not stridulate
you must not stridulate
she must not stridulate
we must not stridulate
you must not stridulate
they must not stridulate 	I must not be stridulating
you must not be stridulating
she must not be stridulating
we must not be stridulating
you must not be stridulating
they must not be stridulating	I must not have stridulated
you must not have stridulated
she must not have stridulated
we must not have stridulated
you must not have stridulated
they must not have stridulated	I must not have been stridulating
you must not have been stridulating
she must not have been stridulating
we must not have been stridulating
you must not have been stridulating
they must not have been stridulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I stridulate?
must you stridulate?
must she stridulate?
must we stridulate?
must you stridulate?
must they stridulate? 	must I be stridulating?
must you be stridulating?
must she be stridulating?
must we be stridulating?
must you be stridulating?
must they be stridulating? 	must I have stridulated?
must you have stridulated?
must she have stridulated?
must we have stridulated?
must you have stridulated?
must they have stridulated? 	must I have been stridulating?
must you have been stridulating?
must she have been stridulating?
must we have been stridulating?
must you have been stridulating?
must they have been stridulating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not stridulate?
must you not stridulate?
must she not stridulate?
must we not stridulate?
must you not stridulate?
must they not stridulate? 	must I not be stridulating?
must you not be stridulating?
must she not be stridulating?
must we not be stridulating?
must you not be stridulating?
must they not be stridulating? 	must I not have stridulated?
must you not have stridulated?
must she not have stridulated?
must we not have stridulated?
must you not have stridulated?
must they not have stridulated? 	must I not have been stridulating?
must you not have been stridulating?
must she not have been stridulating?
must we not have been stridulating?
must you not have been stridulating?
must they not have been stridulating?