English verb conjugation
COULD CHIRR

Regular verb: chirr - chirred - chirred

Affirmation

Simple form	V-ing form
I could chirr you could chirr he could chirr we could chirr you could chirr they could chirr	I could be chirring you could be chirring he 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 he 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 he 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 couldn't chirr you couldn't chirr he couldn't chirr we couldn't chirr you couldn't chirr they couldn't chirr	I couldn't be chirring you couldn't be chirring he couldn't be chirring we couldn't be chirring you couldn't be chirring they couldn't be chirring
Perfect	V-ing perfect
I couldn't have chirred you couldn't have chirred he couldn't have chirred we couldn't have chirred you couldn't have chirred they couldn't have chirred	I couldn't have been chirring you couldn't have been chirring he couldn't have been chirring we couldn't have been chirring you couldn't have been chirring they couldn't have been chirring

Interrogative form

Simple form	V-ing form
could I chirr? could you chirr? could he chirr? could we chirr? could you chirr? could they chirr?	could I be chirring? could you be chirring? could he 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 he 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 he 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
couldn't I chirr? couldn't you chirr? couldn't he chirr? couldn't we chirr? couldn't you chirr? couldn't they chirr?	couldn't I be chirring? couldn't you be chirring? couldn't he be chirring? couldn't we be chirring? couldn't you be chirring? couldn't they be chirring?
Perfect	V-ing perfect
couldn't I have chirred? couldn't you have chirred? couldn't he have chirred? couldn't we have chirred? couldn't you have chirred? couldn't they have chirred?	couldn't I have been chirring? couldn't you have been chirring? couldn't he have been chirring? couldn't we have been chirring? couldn't you have been chirring? couldn't they have been chirring?