I could knit you could knit she could knit we could knit you could knit they could knit
V-ing form
I could be knitting you could be knitting she could be knitting we could be knitting you could be knitting they could be knitting
Perfect
I could have knitted, knit you could have knitted, knit she could have knitted, knit we could have knitted, knit you could have knitted, knit they could have knitted, knit
V-ing perfect
I could have been knitting you could have been knitting she could have been knitting we could have been knitting you could have been knitting they could have been knitting
Negation
Simple form
I could not knit you could not knit she could not knit we could not knit you could not knit they could not knit
V-ing form
I could not be knitting you could not be knitting she could not be knitting we could not be knitting you could not be knitting they could not be knitting
Perfect
I could not have knitted, knit you could not have knitted, knit she could not have knitted, knit we could not have knitted, knit you could not have knitted, knit they could not have knitted, knit
V-ing perfect
I could not have been knitting you could not have been knitting she could not have been knitting we could not have been knitting you could not have been knitting they could not have been knitting
Interrogative form
Simple form
could I knit? could you knit? could she knit? could we knit? could you knit? could they knit?
V-ing form
could I be knitting? could you be knitting? could she be knitting? could we be knitting? could you be knitting? could they be knitting?
Perfect
could I have knitted, knit? could you have knitted, knit? could she have knitted, knit? could we have knitted, knit? could you have knitted, knit? could they have knitted, knit?
V-ing perfect
could I have been knitting? could you have been knitting? could she have been knitting? could we have been knitting? could you have been knitting? could they have been knitting?
Interro-negative form
Simple form
could I not knit? could you not knit? could she not knit? could we not knit? could you not knit? could they not knit?
V-ing form
could I not be knitting? could you not be knitting? could she not be knitting? could we not be knitting? could you not be knitting? could they not be knitting?
Perfect
could I not have knitted, knit? could you not have knitted, knit? could she not have knitted, knit? could we not have knitted, knit? could you not have knitted, knit? could they not have knitted, knit?
V-ing perfect
could I not have been knitting? could you not have been knitting? could she not have been knitting? could we not have been knitting? could you not have been knitting? could they not have been knitting?