I must shilly-shally you must shilly-shally she must shilly-shally we must shilly-shally you must shilly-shally they must shilly-shally
V-ing form
I must be shilly-shallying you must be shilly-shallying she must be shilly-shallying we must be shilly-shallying you must be shilly-shallying they must be shilly-shallying
Perfect
I must have shilly-shallied you must have shilly-shallied she must have shilly-shallied we must have shilly-shallied you must have shilly-shallied they must have shilly-shallied
V-ing perfect
I must have been shilly-shallying you must have been shilly-shallying she must have been shilly-shallying we must have been shilly-shallying you must have been shilly-shallying they must have been shilly-shallying
Negation
Simple form
I mustn't shilly-shally you mustn't shilly-shally she mustn't shilly-shally we mustn't shilly-shally you mustn't shilly-shally they mustn't shilly-shally
V-ing form
I mustn't be shilly-shallying you mustn't be shilly-shallying she mustn't be shilly-shallying we mustn't be shilly-shallying you mustn't be shilly-shallying they mustn't be shilly-shallying
Perfect
I mustn't have shilly-shallied you mustn't have shilly-shallied she mustn't have shilly-shallied we mustn't have shilly-shallied you mustn't have shilly-shallied they mustn't have shilly-shallied
V-ing perfect
I mustn't have been shilly-shallying you mustn't have been shilly-shallying she mustn't have been shilly-shallying we mustn't have been shilly-shallying you mustn't have been shilly-shallying they mustn't have been shilly-shallying
Interrogative form
Simple form
must I shilly-shally? must you shilly-shally? must she shilly-shally? must we shilly-shally? must you shilly-shally? must they shilly-shally?
V-ing form
must I be shilly-shallying? must you be shilly-shallying? must she be shilly-shallying? must we be shilly-shallying? must you be shilly-shallying? must they be shilly-shallying?
Perfect
must I have shilly-shallied? must you have shilly-shallied? must she have shilly-shallied? must we have shilly-shallied? must you have shilly-shallied? must they have shilly-shallied?
V-ing perfect
must I have been shilly-shallying? must you have been shilly-shallying? must she have been shilly-shallying? must we have been shilly-shallying? must you have been shilly-shallying? must they have been shilly-shallying?
Interro-negative form
Simple form
mustn't I shilly-shally? mustn't you shilly-shally? mustn't she shilly-shally? mustn't we shilly-shally? mustn't you shilly-shally? mustn't they shilly-shally?
V-ing form
mustn't I be shilly-shallying? mustn't you be shilly-shallying? mustn't she be shilly-shallying? mustn't we be shilly-shallying? mustn't you be shilly-shallying? mustn't they be shilly-shallying?
Perfect
mustn't I have shilly-shallied? mustn't you have shilly-shallied? mustn't she have shilly-shallied? mustn't we have shilly-shallied? mustn't you have shilly-shallied? mustn't they have shilly-shallied?
V-ing perfect
mustn't I have been shilly-shallying? mustn't you have been shilly-shallying? mustn't she have been shilly-shallying? mustn't we have been shilly-shallying? mustn't you have been shilly-shallying? mustn't they have been shilly-shallying?