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