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