English verb conjugation
CAN ANSWER

Regular verb: answer - answered - answered

Affirmation

Simple form	V-ing form
I can answer you can answer he can answer we can answer you can answer they can answer	I can be answering you can be answering he can be answering we can be answering you can be answering they can be answering
Perfect	V-ing perfect
I can have answered you can have answered he can have answered we can have answered you can have answered they can have answered	I can have been answering you can have been answering he can have been answering we can have been answering you can have been answering they can have been answering

Negation

Simple form	V-ing form
I can't answer you can't answer he can't answer we can't answer you can't answer they can't answer	I can't be answering you can't be answering he can't be answering we can't be answering you can't be answering they can't be answering
Perfect	V-ing perfect
I can't have answered you can't have answered he can't have answered we can't have answered you can't have answered they can't have answered	I can't have been answering you can't have been answering he can't have been answering we can't have been answering you can't have been answering they can't have been answering

Interrogative form

Simple form	V-ing form
can I answer? can you answer? can he answer? can we answer? can you answer? can they answer?	can I be answering? can you be answering? can he be answering? can we be answering? can you be answering? can they be answering?
Perfect	V-ing perfect
can I have answered? can you have answered? can he have answered? can we have answered? can you have answered? can they have answered?	can I have been answering? can you have been answering? can he have been answering? can we have been answering? can you have been answering? can they have been answering?

Interro-negative form

Simple form	V-ing form
can't I answer? can't you answer? can't he answer? can't we answer? can't you answer? can't they answer?	can't I be answering? can't you be answering? can't he be answering? can't we be answering? can't you be answering? can't they be answering?
Perfect	V-ing perfect
can't I have answered? can't you have answered? can't he have answered? can't we have answered? can't you have answered? can't they have answered?	can't I have been answering? can't you have been answering? can't he have been answering? can't we have been answering? can't you have been answering? can't they have been answering?