English verb conjugation
COULD POP

Regular verb: pop - popped - popped

Affirmation

Simple form	V-ing form
I could pop you could pop she could pop we could pop you could pop they could pop	I could be popping you could be popping she could be popping we could be popping you could be popping they could be popping
Perfect	V-ing perfect
I could have popped you could have popped she could have popped we could have popped you could have popped they could have popped	I could have been popping you could have been popping she could have been popping we could have been popping you could have been popping they could have been popping

Negation

Simple form	V-ing form
I couldn't pop you couldn't pop she couldn't pop we couldn't pop you couldn't pop they couldn't pop	I couldn't be popping you couldn't be popping she couldn't be popping we couldn't be popping you couldn't be popping they couldn't be popping
Perfect	V-ing perfect
I couldn't have popped you couldn't have popped she couldn't have popped we couldn't have popped you couldn't have popped they couldn't have popped	I couldn't have been popping you couldn't have been popping she couldn't have been popping we couldn't have been popping you couldn't have been popping they couldn't have been popping

Interrogative form

Simple form	V-ing form
could I pop? could you pop? could she pop? could we pop? could you pop? could they pop?	could I be popping? could you be popping? could she be popping? could we be popping? could you be popping? could they be popping?
Perfect	V-ing perfect
could I have popped? could you have popped? could she have popped? could we have popped? could you have popped? could they have popped?	could I have been popping? could you have been popping? could she have been popping? could we have been popping? could you have been popping? could they have been popping?

Interro-negative form

Simple form	V-ing form
couldn't I pop? couldn't you pop? couldn't she pop? couldn't we pop? couldn't you pop? couldn't they pop?	couldn't I be popping? couldn't you be popping? couldn't she be popping? couldn't we be popping? couldn't you be popping? couldn't they be popping?
Perfect	V-ing perfect
couldn't I have popped? couldn't you have popped? couldn't she have popped? couldn't we have popped? couldn't you have popped? couldn't they have popped?	couldn't I have been popping? couldn't you have been popping? couldn't she have been popping? couldn't we have been popping? couldn't you have been popping? couldn't they have been popping?