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 couldn't knit you couldn't knit she couldn't knit we couldn't knit you couldn't knit they couldn't knit
V-ing form
I couldn't be knitting you couldn't be knitting she couldn't be knitting we couldn't be knitting you couldn't be knitting they couldn't be knitting
Perfect
I couldn't have knitted, knit you couldn't have knitted, knit she couldn't have knitted, knit we couldn't have knitted, knit you couldn't have knitted, knit they couldn't have knitted, knit
V-ing perfect
I couldn't have been knitting you couldn't have been knitting she couldn't have been knitting we couldn't have been knitting you couldn't have been knitting they couldn't 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
couldn't I knit? couldn't you knit? couldn't she knit? couldn't we knit? couldn't you knit? couldn't they knit?
V-ing form
couldn't I be knitting? couldn't you be knitting? couldn't she be knitting? couldn't we be knitting? couldn't you be knitting? couldn't they be knitting?
Perfect
couldn't I have knitted, knit? couldn't you have knitted, knit? couldn't she have knitted, knit? couldn't we have knitted, knit? couldn't you have knitted, knit? couldn't they have knitted, knit?
V-ing perfect
couldn't I have been knitting? couldn't you have been knitting? couldn't she have been knitting? couldn't we have been knitting? couldn't you have been knitting? couldn't they have been knitting?