I must regurgitate you must regurgitate she must regurgitate we must regurgitate you must regurgitate they must regurgitate
V-ing form
I must be regurgitating you must be regurgitating she must be regurgitating we must be regurgitating you must be regurgitating they must be regurgitating
Perfect
I must have regurgitated you must have regurgitated she must have regurgitated we must have regurgitated you must have regurgitated they must have regurgitated
V-ing perfect
I must have been regurgitating you must have been regurgitating she must have been regurgitating we must have been regurgitating you must have been regurgitating they must have been regurgitating
Negation
Simple form
I mustn't regurgitate you mustn't regurgitate she mustn't regurgitate we mustn't regurgitate you mustn't regurgitate they mustn't regurgitate
V-ing form
I mustn't be regurgitating you mustn't be regurgitating she mustn't be regurgitating we mustn't be regurgitating you mustn't be regurgitating they mustn't be regurgitating
Perfect
I mustn't have regurgitated you mustn't have regurgitated she mustn't have regurgitated we mustn't have regurgitated you mustn't have regurgitated they mustn't have regurgitated
V-ing perfect
I mustn't have been regurgitating you mustn't have been regurgitating she mustn't have been regurgitating we mustn't have been regurgitating you mustn't have been regurgitating they mustn't have been regurgitating
Interrogative form
Simple form
must I regurgitate? must you regurgitate? must she regurgitate? must we regurgitate? must you regurgitate? must they regurgitate?
V-ing form
must I be regurgitating? must you be regurgitating? must she be regurgitating? must we be regurgitating? must you be regurgitating? must they be regurgitating?
Perfect
must I have regurgitated? must you have regurgitated? must she have regurgitated? must we have regurgitated? must you have regurgitated? must they have regurgitated?
V-ing perfect
must I have been regurgitating? must you have been regurgitating? must she have been regurgitating? must we have been regurgitating? must you have been regurgitating? must they have been regurgitating?
Interro-negative form
Simple form
mustn't I regurgitate? mustn't you regurgitate? mustn't she regurgitate? mustn't we regurgitate? mustn't you regurgitate? mustn't they regurgitate?
V-ing form
mustn't I be regurgitating? mustn't you be regurgitating? mustn't she be regurgitating? mustn't we be regurgitating? mustn't you be regurgitating? mustn't they be regurgitating?
Perfect
mustn't I have regurgitated? mustn't you have regurgitated? mustn't she have regurgitated? mustn't we have regurgitated? mustn't you have regurgitated? mustn't they have regurgitated?
V-ing perfect
mustn't I have been regurgitating? mustn't you have been regurgitating? mustn't she have been regurgitating? mustn't we have been regurgitating? mustn't you have been regurgitating? mustn't they have been regurgitating?