I must knit you must knit he must knit we must knit you must knit they must knit
V-ing form
I must be knitting you must be knitting he must be knitting we must be knitting you must be knitting they must be knitting
Perfect
I must have knitted, knit you must have knitted, knit he must have knitted, knit we must have knitted, knit you must have knitted, knit they must have knitted, knit
V-ing perfect
I must have been knitting you must have been knitting he must have been knitting we must have been knitting you must have been knitting they must have been knitting
Negation
Simple form
I mustn't knit you mustn't knit he mustn't knit we mustn't knit you mustn't knit they mustn't knit
V-ing form
I mustn't be knitting you mustn't be knitting he mustn't be knitting we mustn't be knitting you mustn't be knitting they mustn't be knitting
Perfect
I mustn't have knitted, knit you mustn't have knitted, knit he mustn't have knitted, knit we mustn't have knitted, knit you mustn't have knitted, knit they mustn't have knitted, knit
V-ing perfect
I mustn't have been knitting you mustn't have been knitting he mustn't have been knitting we mustn't have been knitting you mustn't have been knitting they mustn't have been knitting
Interrogative form
Simple form
must I knit? must you knit? must he knit? must we knit? must you knit? must they knit?
V-ing form
must I be knitting? must you be knitting? must he be knitting? must we be knitting? must you be knitting? must they be knitting?
Perfect
must I have knitted, knit? must you have knitted, knit? must he have knitted, knit? must we have knitted, knit? must you have knitted, knit? must they have knitted, knit?
V-ing perfect
must I have been knitting? must you have been knitting? must he have been knitting? must we have been knitting? must you have been knitting? must they have been knitting?
Interro-negative form
Simple form
mustn't I knit? mustn't you knit? mustn't he knit? mustn't we knit? mustn't you knit? mustn't they knit?
V-ing form
mustn't I be knitting? mustn't you be knitting? mustn't he be knitting? mustn't we be knitting? mustn't you be knitting? mustn't they be knitting?
Perfect
mustn't I have knitted, knit? mustn't you have knitted, knit? mustn't he have knitted, knit? mustn't we have knitted, knit? mustn't you have knitted, knit? mustn't they have knitted, knit?
V-ing perfect
mustn't I have been knitting? mustn't you have been knitting? mustn't he have been knitting? mustn't we have been knitting? mustn't you have been knitting? mustn't they have been knitting?