Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must celebrate celebrate you must celebrate celebrate she must celebrate celebrate we must celebrate celebrate you must celebrate celebrate they must celebrate celebrate
V-ing form
I must be celebrate celebrating you must be celebrate celebrating she must be celebrate celebrating we must be celebrate celebrating you must be celebrate celebrating they must be celebrate celebrating
Perfect
I must have celebrate celebrated you must have celebrate celebrated she must have celebrate celebrated we must have celebrate celebrated you must have celebrate celebrated they must have celebrate celebrated
V-ing perfect
I must have been celebrate celebrating you must have been celebrate celebrating she must have been celebrate celebrating we must have been celebrate celebrating you must have been celebrate celebrating they must have been celebrate celebrating
Negation
Simple form
I mustn't celebrate celebrate you mustn't celebrate celebrate she mustn't celebrate celebrate we mustn't celebrate celebrate you mustn't celebrate celebrate they mustn't celebrate celebrate
V-ing form
I mustn't be celebrate celebrating you mustn't be celebrate celebrating she mustn't be celebrate celebrating we mustn't be celebrate celebrating you mustn't be celebrate celebrating they mustn't be celebrate celebrating
Perfect
I mustn't have celebrate celebrated you mustn't have celebrate celebrated she mustn't have celebrate celebrated we mustn't have celebrate celebrated you mustn't have celebrate celebrated they mustn't have celebrate celebrated
V-ing perfect
I mustn't have been celebrate celebrating you mustn't have been celebrate celebrating she mustn't have been celebrate celebrating we mustn't have been celebrate celebrating you mustn't have been celebrate celebrating they mustn't have been celebrate celebrating
Interrogative form
Simple form
must I celebrate celebrate? must you celebrate celebrate? must she celebrate celebrate? must we celebrate celebrate? must you celebrate celebrate? must they celebrate celebrate?
V-ing form
must I be celebrate celebrating? must you be celebrate celebrating? must she be celebrate celebrating? must we be celebrate celebrating? must you be celebrate celebrating? must they be celebrate celebrating?
Perfect
must I have celebrate celebrated? must you have celebrate celebrated? must she have celebrate celebrated? must we have celebrate celebrated? must you have celebrate celebrated? must they have celebrate celebrated?
V-ing perfect
must I have been celebrate celebrating? must you have been celebrate celebrating? must she have been celebrate celebrating? must we have been celebrate celebrating? must you have been celebrate celebrating? must they have been celebrate celebrating?
Interro-negative form
Simple form
mustn't I celebrate celebrate? mustn't you celebrate celebrate? mustn't she celebrate celebrate? mustn't we celebrate celebrate? mustn't you celebrate celebrate? mustn't they celebrate celebrate?
V-ing form
mustn't I be celebrate celebrating? mustn't you be celebrate celebrating? mustn't she be celebrate celebrating? mustn't we be celebrate celebrating? mustn't you be celebrate celebrating? mustn't they be celebrate celebrating?
Perfect
mustn't I have celebrate celebrated? mustn't you have celebrate celebrated? mustn't she have celebrate celebrated? mustn't we have celebrate celebrated? mustn't you have celebrate celebrated? mustn't they have celebrate celebrated?
V-ing perfect
mustn't I have been celebrate celebrating? mustn't you have been celebrate celebrating? mustn't she have been celebrate celebrating? mustn't we have been celebrate celebrating? mustn't you have been celebrate celebrating? mustn't they have been celebrate celebrating?