English verb conjugation
COULD CHIRRUP

Regular verb: chirrup - chirruped - chirruped

Affirmation

Simple form	V-ing form
I could chirrup you could chirrup he could chirrup we could chirrup you could chirrup they could chirrup	I could be chirruping you could be chirruping he could be chirruping we could be chirruping you could be chirruping they could be chirruping
Perfect	V-ing perfect
I could have chirruped you could have chirruped he could have chirruped we could have chirruped you could have chirruped they could have chirruped	I could have been chirruping you could have been chirruping he could have been chirruping we could have been chirruping you could have been chirruping they could have been chirruping

Negation

Simple form	V-ing form
I couldn't chirrup you couldn't chirrup he couldn't chirrup we couldn't chirrup you couldn't chirrup they couldn't chirrup	I couldn't be chirruping you couldn't be chirruping he couldn't be chirruping we couldn't be chirruping you couldn't be chirruping they couldn't be chirruping
Perfect	V-ing perfect
I couldn't have chirruped you couldn't have chirruped he couldn't have chirruped we couldn't have chirruped you couldn't have chirruped they couldn't have chirruped	I couldn't have been chirruping you couldn't have been chirruping he couldn't have been chirruping we couldn't have been chirruping you couldn't have been chirruping they couldn't have been chirruping

Interrogative form

Simple form	V-ing form
could I chirrup? could you chirrup? could he chirrup? could we chirrup? could you chirrup? could they chirrup?	could I be chirruping? could you be chirruping? could he be chirruping? could we be chirruping? could you be chirruping? could they be chirruping?
Perfect	V-ing perfect
could I have chirruped? could you have chirruped? could he have chirruped? could we have chirruped? could you have chirruped? could they have chirruped?	could I have been chirruping? could you have been chirruping? could he have been chirruping? could we have been chirruping? could you have been chirruping? could they have been chirruping?

Interro-negative form

Simple form	V-ing form
couldn't I chirrup? couldn't you chirrup? couldn't he chirrup? couldn't we chirrup? couldn't you chirrup? couldn't they chirrup?	couldn't I be chirruping? couldn't you be chirruping? couldn't he be chirruping? couldn't we be chirruping? couldn't you be chirruping? couldn't they be chirruping?
Perfect	V-ing perfect
couldn't I have chirruped? couldn't you have chirruped? couldn't he have chirruped? couldn't we have chirruped? couldn't you have chirruped? couldn't they have chirruped?	couldn't I have been chirruping? couldn't you have been chirruping? couldn't he have been chirruping? couldn't we have been chirruping? couldn't you have been chirruping? couldn't they have been chirruping?