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