English verb conjugation
COULD CHIRR

Regular verb: chirr - chirred - chirred

Affirmation

Simple form	V-ing form
I could chirr you could chirr she could chirr we could chirr you could chirr they could chirr	I could be chirring you could be chirring she could be chirring we could be chirring you could be chirring they could be chirring
Perfect	V-ing perfect
I could have chirred you could have chirred she could have chirred we could have chirred you could have chirred they could have chirred	I could have been chirring you could have been chirring she could have been chirring we could have been chirring you could have been chirring they could have been chirring

Negation

Simple form	V-ing form
I could not chirr you could not chirr she could not chirr we could not chirr you could not chirr they could not chirr	I could not be chirring you could not be chirring she could not be chirring we could not be chirring you could not be chirring they could not be chirring
Perfect	V-ing perfect
I could not have chirred you could not have chirred she could not have chirred we could not have chirred you could not have chirred they could not have chirred	I could not have been chirring you could not have been chirring she could not have been chirring we could not have been chirring you could not have been chirring they could not have been chirring

Interrogative form

Simple form	V-ing form
could I chirr? could you chirr? could she chirr? could we chirr? could you chirr? could they chirr?	could I be chirring? could you be chirring? could she be chirring? could we be chirring? could you be chirring? could they be chirring?
Perfect	V-ing perfect
could I have chirred? could you have chirred? could she have chirred? could we have chirred? could you have chirred? could they have chirred?	could I have been chirring? could you have been chirring? could she have been chirring? could we have been chirring? could you have been chirring? could they have been chirring?

Interro-negative form

Simple form	V-ing form
could I not chirr? could you not chirr? could she not chirr? could we not chirr? could you not chirr? could they not chirr?	could I not be chirring? could you not be chirring? could she not be chirring? could we not be chirring? could you not be chirring? could they not be chirring?
Perfect	V-ing perfect
could I not have chirred? could you not have chirred? could she not have chirred? could we not have chirred? could you not have chirred? could they not have chirred?	could I not have been chirring? could you not have been chirring? could she not have been chirring? could we not have been chirring? could you not have been chirring? could they not have been chirring?