I can poke you can poke she can poke we can poke you can poke they can poke
V-ing form
I can be poking you can be poking she can be poking we can be poking you can be poking they can be poking
Perfect
I can have poked you can have poked she can have poked we can have poked you can have poked they can have poked
V-ing perfect
I can have been poking you can have been poking she can have been poking we can have been poking you can have been poking they can have been poking
Negation
Simple form
I can't poke you can't poke she can't poke we can't poke you can't poke they can't poke
V-ing form
I can't be poking you can't be poking she can't be poking we can't be poking you can't be poking they can't be poking
Perfect
I can't have poked you can't have poked she can't have poked we can't have poked you can't have poked they can't have poked
V-ing perfect
I can't have been poking you can't have been poking she can't have been poking we can't have been poking you can't have been poking they can't have been poking
Interrogative form
Simple form
can I poke? can you poke? can she poke? can we poke? can you poke? can they poke?
V-ing form
can I be poking? can you be poking? can she be poking? can we be poking? can you be poking? can they be poking?
Perfect
can I have poked? can you have poked? can she have poked? can we have poked? can you have poked? can they have poked?
V-ing perfect
can I have been poking? can you have been poking? can she have been poking? can we have been poking? can you have been poking? can they have been poking?
Interro-negative form
Simple form
can't I poke? can't you poke? can't she poke? can't we poke? can't you poke? can't they poke?
V-ing form
can't I be poking? can't you be poking? can't she be poking? can't we be poking? can't you be poking? can't they be poking?
Perfect
can't I have poked? can't you have poked? can't she have poked? can't we have poked? can't you have poked? can't they have poked?
V-ing perfect
can't I have been poking? can't you have been poking? can't she have been poking? can't we have been poking? can't you have been poking? can't they have been poking?