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