English verb conjugation
CAN WALK

Regular verb: walk - walked - walked

Affirmation

Simple form	V-ing form
I can walk you can walk he can walk we can walk you can walk they can walk	I can be walking you can be walking he can be walking we can be walking you can be walking they can be walking
Perfect	V-ing perfect
I can have walked you can have walked he can have walked we can have walked you can have walked they can have walked	I can have been walking you can have been walking he can have been walking we can have been walking you can have been walking they can have been walking

Negation

Simple form	V-ing form
I cannot walk you cannot walk he cannot walk we cannot walk you cannot walk they cannot walk	I cannot be walking you cannot be walking he cannot be walking we cannot be walking you cannot be walking they cannot be walking
Perfect	V-ing perfect
I cannot have walked you cannot have walked he cannot have walked we cannot have walked you cannot have walked they cannot have walked	I cannot have been walking you cannot have been walking he cannot have been walking we cannot have been walking you cannot have been walking they cannot have been walking

Interrogative form

Simple form	V-ing form
can I walk? can you walk? can he walk? can we walk? can you walk? can they walk?	can I be walking? can you be walking? can he be walking? can we be walking? can you be walking? can they be walking?
Perfect	V-ing perfect
can I have walked? can you have walked? can he have walked? can we have walked? can you have walked? can they have walked?	can I have been walking? can you have been walking? can he have been walking? can we have been walking? can you have been walking? can they have been walking?

Interro-negative form

Simple form	V-ing form
can I not walk? can you not walk? can he not walk? can we not walk? can you not walk? can they not walk?	can I not be walking? can you not be walking? can he not be walking? can we not be walking? can you not be walking? can they not be walking?
Perfect	V-ing perfect
can I not have walked? can you not have walked? can he not have walked? can we not have walked? can you not have walked? can they not have walked?	can I not have been walking? can you not have been walking? can he not have been walking? can we not have been walking? can you not have been walking? can they not have been walking?