English verb conjugation
MUST DROWSE

Regular verb: drowse - drowsed - drowsed

Affirmation

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