I must fling you must fling he must fling we must fling you must fling they must fling
V-ing form
I must be flinging you must be flinging he must be flinging we must be flinging you must be flinging they must be flinging
Perfect
I must have flung you must have flung he 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 he 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 he 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 he 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 he 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 he 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 he fling? must we fling? must you fling? must they fling?
V-ing form
must I be flinging? must you be flinging? must he be flinging? must we be flinging? must you be flinging? must they be flinging?
Perfect
must I have flung? must you have flung? must he 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 he 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 he 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 he 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 he 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 he have been flinging? mustn't we have been flinging? mustn't you have been flinging? mustn't they have been flinging?