must stick
Irregular verb: stick - stuck- stuck

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must stick
you must stick
she must stick
we must stick
you must stick
they must stick 	I must be sticking
you must be sticking
she must be sticking
we must be sticking
you must be sticking
they must be sticking	I must have stuck
you must have stuck
she must have stuck
we must have stuck
you must have stuck
they must have stuck	I must have been sticking
you must have been sticking
she must have been sticking
we must have been sticking
you must have been sticking
they must have been sticking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not stick
you must not stick
she must not stick
we must not stick
you must not stick
they must not stick 	I must not be sticking
you must not be sticking
she must not be sticking
we must not be sticking
you must not be sticking
they must not be sticking	I must not have stuck
you must not have stuck
she must not have stuck
we must not have stuck
you must not have stuck
they must not have stuck	I must not have been sticking
you must not have been sticking
she must not have been sticking
we must not have been sticking
you must not have been sticking
they must not have been sticking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I stick?
must you stick?
must she stick?
must we stick?
must you stick?
must they stick? 	must I be sticking?
must you be sticking?
must she be sticking?
must we be sticking?
must you be sticking?
must they be sticking? 	must I have stuck?
must you have stuck?
must she have stuck?
must we have stuck?
must you have stuck?
must they have stuck? 	must I have been sticking?
must you have been sticking?
must she have been sticking?
must we have been sticking?
must you have been sticking?
must they have been sticking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not stick?
must you not stick?
must she not stick?
must we not stick?
must you not stick?
must they not stick? 	must I not be sticking?
must you not be sticking?
must she not be sticking?
must we not be sticking?
must you not be sticking?
must they not be sticking? 	must I not have stuck?
must you not have stuck?
must she not have stuck?
must we not have stuck?
must you not have stuck?
must they not have stuck? 	must I not have been sticking?
must you not have been sticking?
must she not have been sticking?
must we not have been sticking?
must you not have been sticking?
must they not have been sticking?