must stimulate
Regular verb: stimulate - stimulated- stimulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must stimulate
you must stimulate
she must stimulate
we must stimulate
you must stimulate
they must stimulate 	I must be stimulating
you must be stimulating
she must be stimulating
we must be stimulating
you must be stimulating
they must be stimulating	I must have stimulated
you must have stimulated
she must have stimulated
we must have stimulated
you must have stimulated
they must have stimulated	I must have been stimulating
you must have been stimulating
she must have been stimulating
we must have been stimulating
you must have been stimulating
they must have been stimulating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not stimulate
you must not stimulate
she must not stimulate
we must not stimulate
you must not stimulate
they must not stimulate 	I must not be stimulating
you must not be stimulating
she must not be stimulating
we must not be stimulating
you must not be stimulating
they must not be stimulating	I must not have stimulated
you must not have stimulated
she must not have stimulated
we must not have stimulated
you must not have stimulated
they must not have stimulated	I must not have been stimulating
you must not have been stimulating
she must not have been stimulating
we must not have been stimulating
you must not have been stimulating
they must not have been stimulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I stimulate?
must you stimulate?
must she stimulate?
must we stimulate?
must you stimulate?
must they stimulate? 	must I be stimulating?
must you be stimulating?
must she be stimulating?
must we be stimulating?
must you be stimulating?
must they be stimulating? 	must I have stimulated?
must you have stimulated?
must she have stimulated?
must we have stimulated?
must you have stimulated?
must they have stimulated? 	must I have been stimulating?
must you have been stimulating?
must she have been stimulating?
must we have been stimulating?
must you have been stimulating?
must they have been stimulating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not stimulate?
must you not stimulate?
must she not stimulate?
must we not stimulate?
must you not stimulate?
must they not stimulate? 	must I not be stimulating?
must you not be stimulating?
must she not be stimulating?
must we not be stimulating?
must you not be stimulating?
must they not be stimulating? 	must I not have stimulated?
must you not have stimulated?
must she not have stimulated?
must we not have stimulated?
must you not have stimulated?
must they not have stimulated? 	must I not have been stimulating?
must you not have been stimulating?
must she not have been stimulating?
must we not have been stimulating?
must you not have been stimulating?
must they not have been stimulating?