must stridulate
Regular verb: stridulate - stridulated- stridulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must stridulate
you must stridulate
he must stridulate
we must stridulate
you must stridulate
they must stridulate 	I must be stridulating
you must be stridulating
he must be stridulating
we must be stridulating
you must be stridulating
they must be stridulating	I must have stridulated
you must have stridulated
he 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
he 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 mustn't stridulate
you mustn't stridulate
he mustn't stridulate
we mustn't stridulate
you mustn't stridulate
they mustn't stridulate 	I mustn't be stridulating
you mustn't be stridulating
he mustn't be stridulating
we mustn't be stridulating
you mustn't be stridulating
they mustn't be stridulating	I mustn't have stridulated
you mustn't have stridulated
he mustn't have stridulated
we mustn't have stridulated
you mustn't have stridulated
they mustn't have stridulated	I mustn't have been stridulating
you mustn't have been stridulating
he mustn't have been stridulating
we mustn't have been stridulating
you mustn't have been stridulating
they mustn't have been stridulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I stridulate?
must you stridulate?
must he stridulate?
must we stridulate?
must you stridulate?
must they stridulate? 	must I be stridulating?
must you be stridulating?
must he be stridulating?
must we be stridulating?
must you be stridulating?
must they be stridulating? 	must I have stridulated?
must you have stridulated?
must he 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 he 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 	
mustn't I stridulate?
mustn't you stridulate?
mustn't he stridulate?
mustn't we stridulate?
mustn't you stridulate?
mustn't they stridulate? 	mustn't I be stridulating?
mustn't you be stridulating?
mustn't he be stridulating?
mustn't we be stridulating?
mustn't you be stridulating?
mustn't they be stridulating? 	mustn't I have stridulated?
mustn't you have stridulated?
mustn't he have stridulated?
mustn't we have stridulated?
mustn't you have stridulated?
mustn't they have stridulated? 	mustn't I have been stridulating?
mustn't you have been stridulating?
mustn't he have been stridulating?
mustn't we have been stridulating?
mustn't you have been stridulating?
mustn't they have been stridulating?