I must masturbate you must masturbate she must masturbate we must masturbate you must masturbate they must masturbate
V-ing form
I must be masturbating you must be masturbating she must be masturbating we must be masturbating you must be masturbating they must be masturbating
Perfect
I must have masturbated you must have masturbated she must have masturbated we must have masturbated you must have masturbated they must have masturbated
V-ing perfect
I must have been masturbating you must have been masturbating she must have been masturbating we must have been masturbating you must have been masturbating they must have been masturbating
Negation
Simple form
I must not masturbate you must not masturbate she must not masturbate we must not masturbate you must not masturbate they must not masturbate
V-ing form
I must not be masturbating you must not be masturbating she must not be masturbating we must not be masturbating you must not be masturbating they must not be masturbating
Perfect
I must not have masturbated you must not have masturbated she must not have masturbated we must not have masturbated you must not have masturbated they must not have masturbated
V-ing perfect
I must not have been masturbating you must not have been masturbating she must not have been masturbating we must not have been masturbating you must not have been masturbating they must not have been masturbating
Interrogative form
Simple form
must I masturbate? must you masturbate? must she masturbate? must we masturbate? must you masturbate? must they masturbate?
V-ing form
must I be masturbating? must you be masturbating? must she be masturbating? must we be masturbating? must you be masturbating? must they be masturbating?
Perfect
must I have masturbated? must you have masturbated? must she have masturbated? must we have masturbated? must you have masturbated? must they have masturbated?
V-ing perfect
must I have been masturbating? must you have been masturbating? must she have been masturbating? must we have been masturbating? must you have been masturbating? must they have been masturbating?
Interro-negative form
Simple form
must I not masturbate? must you not masturbate? must she not masturbate? must we not masturbate? must you not masturbate? must they not masturbate?
V-ing form
must I not be masturbating? must you not be masturbating? must she not be masturbating? must we not be masturbating? must you not be masturbating? must they not be masturbating?
Perfect
must I not have masturbated? must you not have masturbated? must she not have masturbated? must we not have masturbated? must you not have masturbated? must they not have masturbated?
V-ing perfect
must I not have been masturbating? must you not have been masturbating? must she not have been masturbating? must we not have been masturbating? must you not have been masturbating? must they not have been masturbating?