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