English verb conjugation
COULD CHIRP

Regular verb: chirp - chirped - chirped

Affirmation

Simple form	V-ing form
I could chirp you could chirp he could chirp we could chirp you could chirp they could chirp	I could be chirping you could be chirping he could be chirping we could be chirping you could be chirping they could be chirping
Perfect	V-ing perfect
I could have chirped you could have chirped he could have chirped we could have chirped you could have chirped they could have chirped	I could have been chirping you could have been chirping he could have been chirping we could have been chirping you could have been chirping they could have been chirping

Negation

Simple form	V-ing form
I couldn't chirp you couldn't chirp he couldn't chirp we couldn't chirp you couldn't chirp they couldn't chirp	I couldn't be chirping you couldn't be chirping he couldn't be chirping we couldn't be chirping you couldn't be chirping they couldn't be chirping
Perfect	V-ing perfect
I couldn't have chirped you couldn't have chirped he couldn't have chirped we couldn't have chirped you couldn't have chirped they couldn't have chirped	I couldn't have been chirping you couldn't have been chirping he couldn't have been chirping we couldn't have been chirping you couldn't have been chirping they couldn't have been chirping

Interrogative form

Simple form	V-ing form
could I chirp? could you chirp? could he chirp? could we chirp? could you chirp? could they chirp?	could I be chirping? could you be chirping? could he be chirping? could we be chirping? could you be chirping? could they be chirping?
Perfect	V-ing perfect
could I have chirped? could you have chirped? could he have chirped? could we have chirped? could you have chirped? could they have chirped?	could I have been chirping? could you have been chirping? could he have been chirping? could we have been chirping? could you have been chirping? could they have been chirping?

Interro-negative form

Simple form	V-ing form
couldn't I chirp? couldn't you chirp? couldn't he chirp? couldn't we chirp? couldn't you chirp? couldn't they chirp?	couldn't I be chirping? couldn't you be chirping? couldn't he be chirping? couldn't we be chirping? couldn't you be chirping? couldn't they be chirping?
Perfect	V-ing perfect
couldn't I have chirped? couldn't you have chirped? couldn't he have chirped? couldn't we have chirped? couldn't you have chirped? couldn't they have chirped?	couldn't I have been chirping? couldn't you have been chirping? couldn't he have been chirping? couldn't we have been chirping? couldn't you have been chirping? couldn't they have been chirping?