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 can't walk you can't walk he can't walk we can't walk you can't walk they can't walk	I can't be walking you can't be walking he can't be walking we can't be walking you can't be walking they can't be walking
Perfect	V-ing perfect
I can't have walked you can't have walked he can't have walked we can't have walked you can't have walked they can't have walked	I can't have been walking you can't have been walking he can't have been walking we can't have been walking you can't have been walking they can't 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't I walk? can't you walk? can't he walk? can't we walk? can't you walk? can't they walk?	can't I be walking? can't you be walking? can't he be walking? can't we be walking? can't you be walking? can't they be walking?
Perfect	V-ing perfect
can't I have walked? can't you have walked? can't he have walked? can't we have walked? can't you have walked? can't they have walked?	can't I have been walking? can't you have been walking? can't he have been walking? can't we have been walking? can't you have been walking? can't they have been walking?