English verb conjugation
MUST TUB

Regular verb: tub - tubbed - tubbed

Affirmation

Simple form	V-ing form
I must tub you must tub she must tub we must tub you must tub they must tub	I must be tubbing you must be tubbing she 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 she 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 she 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 mustn't tub you mustn't tub she mustn't tub we mustn't tub you mustn't tub they mustn't tub	I mustn't be tubbing you mustn't be tubbing she mustn't be tubbing we mustn't be tubbing you mustn't be tubbing they mustn't be tubbing
Perfect	V-ing perfect
I mustn't have tubbed you mustn't have tubbed she mustn't have tubbed we mustn't have tubbed you mustn't have tubbed they mustn't have tubbed	I mustn't have been tubbing you mustn't have been tubbing she mustn't have been tubbing we mustn't have been tubbing you mustn't have been tubbing they mustn't have been tubbing

Interrogative form

Simple form	V-ing form
must I tub? must you tub? must she tub? must we tub? must you tub? must they tub?	must I be tubbing? must you be tubbing? must she 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 she 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 she 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
mustn't I tub? mustn't you tub? mustn't she tub? mustn't we tub? mustn't you tub? mustn't they tub?	mustn't I be tubbing? mustn't you be tubbing? mustn't she be tubbing? mustn't we be tubbing? mustn't you be tubbing? mustn't they be tubbing?
Perfect	V-ing perfect
mustn't I have tubbed? mustn't you have tubbed? mustn't she have tubbed? mustn't we have tubbed? mustn't you have tubbed? mustn't they have tubbed?	mustn't I have been tubbing? mustn't you have been tubbing? mustn't she have been tubbing? mustn't we have been tubbing? mustn't you have been tubbing? mustn't they have been tubbing?