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