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 can't pop you can't pop he can't pop we can't pop you can't pop they can't pop	I can't be popping you can't be popping he can't be popping we can't be popping you can't be popping they can't be popping
Perfect	V-ing perfect
I can't have popped you can't have popped he can't have popped we can't have popped you can't have popped they can't have popped	I can't have been popping you can't have been popping he can't have been popping we can't have been popping you can't have been popping they can't 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't I pop? can't you pop? can't he pop? can't we pop? can't you pop? can't they pop?	can't I be popping? can't you be popping? can't he be popping? can't we be popping? can't you be popping? can't they be popping?
Perfect	V-ing perfect
can't I have popped? can't you have popped? can't he have popped? can't we have popped? can't you have popped? can't they have popped?	can't I have been popping? can't you have been popping? can't he have been popping? can't we have been popping? can't you have been popping? can't they have been popping?