English verb conjugation
MUST TROUBLE

Regular verb: trouble - troubled - troubled

Affirmation

Simple form	V-ing form
I must trouble you must trouble he must trouble we must trouble you must trouble they must trouble	I must be troubling you must be troubling he must be troubling we must be troubling you must be troubling they must be troubling
Perfect	V-ing perfect
I must have troubled you must have troubled he must have troubled we must have troubled you must have troubled they must have troubled	I must have been troubling you must have been troubling he must have been troubling we must have been troubling you must have been troubling they must have been troubling

Negation

Simple form	V-ing form
I must not trouble you must not trouble he must not trouble we must not trouble you must not trouble they must not trouble	I must not be troubling you must not be troubling he must not be troubling we must not be troubling you must not be troubling they must not be troubling
Perfect	V-ing perfect
I must not have troubled you must not have troubled he must not have troubled we must not have troubled you must not have troubled they must not have troubled	I must not have been troubling you must not have been troubling he must not have been troubling we must not have been troubling you must not have been troubling they must not have been troubling

Interrogative form

Simple form	V-ing form
must I trouble? must you trouble? must he trouble? must we trouble? must you trouble? must they trouble?	must I be troubling? must you be troubling? must he be troubling? must we be troubling? must you be troubling? must they be troubling?
Perfect	V-ing perfect
must I have troubled? must you have troubled? must he have troubled? must we have troubled? must you have troubled? must they have troubled?	must I have been troubling? must you have been troubling? must he have been troubling? must we have been troubling? must you have been troubling? must they have been troubling?

Interro-negative form

Simple form	V-ing form
must I not trouble? must you not trouble? must he not trouble? must we not trouble? must you not trouble? must they not trouble?	must I not be troubling? must you not be troubling? must he not be troubling? must we not be troubling? must you not be troubling? must they not be troubling?
Perfect	V-ing perfect
must I not have troubled? must you not have troubled? must he not have troubled? must we not have troubled? must you not have troubled? must they not have troubled?	must I not have been troubling? must you not have been troubling? must he not have been troubling? must we not have been troubling? must you not have been troubling? must they not have been troubling?