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