English verb conjugation
CAN POP

Regular verb: pop - popped - popped

Affirmation

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

Negation

Simple form	V-ing form
I cannot pop you cannot pop he cannot pop we cannot pop you cannot pop they cannot pop	I cannot be popping you cannot be popping he cannot be popping we cannot be popping you cannot be popping they cannot be popping
Perfect	V-ing perfect
I cannot have popped you cannot have popped he cannot have popped we cannot have popped you cannot have popped they cannot have popped	I cannot have been popping you cannot have been popping he cannot have been popping we cannot have been popping you cannot have been popping they cannot have been popping

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can I not pop? can you not pop? can he not pop? can we not pop? can you not pop? can they not pop?	can I not be popping? can you not be popping? can he not be popping? can we not be popping? can you not be popping? can they not be popping?
Perfect	V-ing perfect
can I not have popped? can you not have popped? can he not have popped? can we not have popped? can you not have popped? can they not have popped?	can I not have been popping? can you not have been popping? can he not have been popping? can we not have been popping? can you not have been popping? can they not have been popping?