English verb conjugation
COULD KNOLL

Regular verb: knoll - knolled - knolled

Affirmation

Simple form	V-ing form
I could knoll you could knoll he could knoll we could knoll you could knoll they could knoll	I could be knolling you could be knolling he 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 he 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 he 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 he 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 he 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 he 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 he 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 he knoll? could we knoll? could you knoll? could they knoll?	could I be knolling? could you be knolling? could he 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 he 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 he 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 he 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 he 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 he 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 he have been knolling? couldn't we have been knolling? couldn't you have been knolling? couldn't they have been knolling?