English verb conjugation
MUST TUB

Regular verb: tub - tubbed - tubbed

Affirmation

Simple form	V-ing form
I must tub you must tub he must tub we must tub you must tub they must tub	I must be tubbing you must be tubbing he must be tubbing we must be tubbing you must be tubbing they must be tubbing
Perfect	V-ing perfect
I must have tubbed you must have tubbed he must have tubbed we must have tubbed you must have tubbed they must have tubbed	I must have been tubbing you must have been tubbing he must have been tubbing we must have been tubbing you must have been tubbing they must have been tubbing

Negation

Simple form	V-ing form
I must not tub you must not tub he must not tub we must not tub you must not tub they must not tub	I must not be tubbing you must not be tubbing he must not be tubbing we must not be tubbing you must not be tubbing they must not be tubbing
Perfect	V-ing perfect
I must not have tubbed you must not have tubbed he must not have tubbed we must not have tubbed you must not have tubbed they must not have tubbed	I must not have been tubbing you must not have been tubbing he must not have been tubbing we must not have been tubbing you must not have been tubbing they must not have been tubbing

Interrogative form

Simple form	V-ing form
must I tub? must you tub? must he tub? must we tub? must you tub? must they tub?	must I be tubbing? must you be tubbing? must he be tubbing? must we be tubbing? must you be tubbing? must they be tubbing?
Perfect	V-ing perfect
must I have tubbed? must you have tubbed? must he have tubbed? must we have tubbed? must you have tubbed? must they have tubbed?	must I have been tubbing? must you have been tubbing? must he have been tubbing? must we have been tubbing? must you have been tubbing? must they have been tubbing?

Interro-negative form

Simple form	V-ing form
must I not tub? must you not tub? must he not tub? must we not tub? must you not tub? must they not tub?	must I not be tubbing? must you not be tubbing? must he not be tubbing? must we not be tubbing? must you not be tubbing? must they not be tubbing?
Perfect	V-ing perfect
must I not have tubbed? must you not have tubbed? must he not have tubbed? must we not have tubbed? must you not have tubbed? must they not have tubbed?	must I not have been tubbing? must you not have been tubbing? must he not have been tubbing? must we not have been tubbing? must you not have been tubbing? must they not have been tubbing?