English verb conjugation
COULD KNOLL

Regular verb: knoll - knolled - knolled

Affirmation

Simple form	V-ing form
I could knoll you could knoll she could knoll we could knoll you could knoll they could knoll	I could be knolling you could be knolling she could be knolling we could be knolling you could be knolling they could be knolling
Perfect	V-ing perfect
I could have knolled you could have knolled she could have knolled we could have knolled you could have knolled they could have knolled	I could have been knolling you could have been knolling she could have been knolling we could have been knolling you could have been knolling they could have been knolling

Negation

Simple form	V-ing form
I couldn't knoll you couldn't knoll she couldn't knoll we couldn't knoll you couldn't knoll they couldn't knoll	I couldn't be knolling you couldn't be knolling she couldn't be knolling we couldn't be knolling you couldn't be knolling they couldn't be knolling
Perfect	V-ing perfect
I couldn't have knolled you couldn't have knolled she couldn't have knolled we couldn't have knolled you couldn't have knolled they couldn't have knolled	I couldn't have been knolling you couldn't have been knolling she couldn't have been knolling we couldn't have been knolling you couldn't have been knolling they couldn't have been knolling

Interrogative form

Simple form	V-ing form
could I knoll? could you knoll? could she knoll? could we knoll? could you knoll? could they knoll?	could I be knolling? could you be knolling? could she be knolling? could we be knolling? could you be knolling? could they be knolling?
Perfect	V-ing perfect
could I have knolled? could you have knolled? could she have knolled? could we have knolled? could you have knolled? could they have knolled?	could I have been knolling? could you have been knolling? could she have been knolling? could we have been knolling? could you have been knolling? could they have been knolling?

Interro-negative form

Simple form	V-ing form
couldn't I knoll? couldn't you knoll? couldn't she knoll? couldn't we knoll? couldn't you knoll? couldn't they knoll?	couldn't I be knolling? couldn't you be knolling? couldn't she be knolling? couldn't we be knolling? couldn't you be knolling? couldn't they be knolling?
Perfect	V-ing perfect
couldn't I have knolled? couldn't you have knolled? couldn't she have knolled? couldn't we have knolled? couldn't you have knolled? couldn't they have knolled?	couldn't I have been knolling? couldn't you have been knolling? couldn't she have been knolling? couldn't we have been knolling? couldn't you have been knolling? couldn't they have been knolling?