must tub tub
Regular verb: tub tub - tub tubed- tub tubed

, this verb may not exist. Conjugation is given as example.

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must tub tub
you must tub tub
she must tub tub
we must tub tub
you must tub tub
they must tub tub 	I must be tub tubing
you must be tub tubing
she must be tub tubing
we must be tub tubing
you must be tub tubing
they must be tub tubing	I must have tub tubed
you must have tub tubed
she must have tub tubed
we must have tub tubed
you must have tub tubed
they must have tub tubed	I must have been tub tubing
you must have been tub tubing
she must have been tub tubing
we must have been tub tubing
you must have been tub tubing
they must have been tub tubing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not tub tub
you must not tub tub
she must not tub tub
we must not tub tub
you must not tub tub
they must not tub tub 	I must not be tub tubing
you must not be tub tubing
she must not be tub tubing
we must not be tub tubing
you must not be tub tubing
they must not be tub tubing	I must not have tub tubed
you must not have tub tubed
she must not have tub tubed
we must not have tub tubed
you must not have tub tubed
they must not have tub tubed	I must not have been tub tubing
you must not have been tub tubing
she must not have been tub tubing
we must not have been tub tubing
you must not have been tub tubing
they must not have been tub tubing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I tub tub?
must you tub tub?
must she tub tub?
must we tub tub?
must you tub tub?
must they tub tub? 	must I be tub tubing?
must you be tub tubing?
must she be tub tubing?
must we be tub tubing?
must you be tub tubing?
must they be tub tubing? 	must I have tub tubed?
must you have tub tubed?
must she have tub tubed?
must we have tub tubed?
must you have tub tubed?
must they have tub tubed? 	must I have been tub tubing?
must you have been tub tubing?
must she have been tub tubing?
must we have been tub tubing?
must you have been tub tubing?
must they have been tub tubing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not tub tub?
must you not tub tub?
must she not tub tub?
must we not tub tub?
must you not tub tub?
must they not tub tub? 	must I not be tub tubing?
must you not be tub tubing?
must she not be tub tubing?
must we not be tub tubing?
must you not be tub tubing?
must they not be tub tubing? 	must I not have tub tubed?
must you not have tub tubed?
must she not have tub tubed?
must we not have tub tubed?
must you not have tub tubed?
must they not have tub tubed? 	must I not have been tub tubing?
must you not have been tub tubing?
must she not have been tub tubing?
must we not have been tub tubing?
must you not have been tub tubing?
must they not have been tub tubing?