English verb conjugation
COULD CIRCLE

Regular verb: circle - circled - circled

Affirmation

Simple form	V-ing form
I could circle you could circle she could circle we could circle you could circle they could circle	I could be circling you could be circling she could be circling we could be circling you could be circling they could be circling
Perfect	V-ing perfect
I could have circled you could have circled she could have circled we could have circled you could have circled they could have circled	I could have been circling you could have been circling she could have been circling we could have been circling you could have been circling they could have been circling

Negation

Simple form	V-ing form
I couldn't circle you couldn't circle she couldn't circle we couldn't circle you couldn't circle they couldn't circle	I couldn't be circling you couldn't be circling she couldn't be circling we couldn't be circling you couldn't be circling they couldn't be circling
Perfect	V-ing perfect
I couldn't have circled you couldn't have circled she couldn't have circled we couldn't have circled you couldn't have circled they couldn't have circled	I couldn't have been circling you couldn't have been circling she couldn't have been circling we couldn't have been circling you couldn't have been circling they couldn't have been circling

Interrogative form

Simple form	V-ing form
could I circle? could you circle? could she circle? could we circle? could you circle? could they circle?	could I be circling? could you be circling? could she be circling? could we be circling? could you be circling? could they be circling?
Perfect	V-ing perfect
could I have circled? could you have circled? could she have circled? could we have circled? could you have circled? could they have circled?	could I have been circling? could you have been circling? could she have been circling? could we have been circling? could you have been circling? could they have been circling?

Interro-negative form

Simple form	V-ing form
couldn't I circle? couldn't you circle? couldn't she circle? couldn't we circle? couldn't you circle? couldn't they circle?	couldn't I be circling? couldn't you be circling? couldn't she be circling? couldn't we be circling? couldn't you be circling? couldn't they be circling?
Perfect	V-ing perfect
couldn't I have circled? couldn't you have circled? couldn't she have circled? couldn't we have circled? couldn't you have circled? couldn't they have circled?	couldn't I have been circling? couldn't you have been circling? couldn't she have been circling? couldn't we have been circling? couldn't you have been circling? couldn't they have been circling?