must drowse
Regular verb: drowse - drowsed- drowsed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must drowse
you must drowse
she must drowse
we must drowse
you must drowse
they must drowse 	I must be drowsing
you must be drowsing
she must be drowsing
we must be drowsing
you must be drowsing
they must be drowsing	I must have drowsed
you must have drowsed
she must have drowsed
we must have drowsed
you must have drowsed
they must have drowsed	I must have been drowsing
you must have been drowsing
she must have been drowsing
we must have been drowsing
you must have been drowsing
they must have been drowsing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not drowse
you must not drowse
she must not drowse
we must not drowse
you must not drowse
they must not drowse 	I must not be drowsing
you must not be drowsing
she must not be drowsing
we must not be drowsing
you must not be drowsing
they must not be drowsing	I must not have drowsed
you must not have drowsed
she must not have drowsed
we must not have drowsed
you must not have drowsed
they must not have drowsed	I must not have been drowsing
you must not have been drowsing
she must not have been drowsing
we must not have been drowsing
you must not have been drowsing
they must not have been drowsing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I drowse?
must you drowse?
must she drowse?
must we drowse?
must you drowse?
must they drowse? 	must I be drowsing?
must you be drowsing?
must she be drowsing?
must we be drowsing?
must you be drowsing?
must they be drowsing? 	must I have drowsed?
must you have drowsed?
must she have drowsed?
must we have drowsed?
must you have drowsed?
must they have drowsed? 	must I have been drowsing?
must you have been drowsing?
must she have been drowsing?
must we have been drowsing?
must you have been drowsing?
must they have been drowsing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not drowse?
must you not drowse?
must she not drowse?
must we not drowse?
must you not drowse?
must they not drowse? 	must I not be drowsing?
must you not be drowsing?
must she not be drowsing?
must we not be drowsing?
must you not be drowsing?
must they not be drowsing? 	must I not have drowsed?
must you not have drowsed?
must she not have drowsed?
must we not have drowsed?
must you not have drowsed?
must they not have drowsed? 	must I not have been drowsing?
must you not have been drowsing?
must she not have been drowsing?
must we not have been drowsing?
must you not have been drowsing?
must they not have been drowsing?