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 cannot poke you cannot poke she cannot poke we cannot poke you cannot poke they cannot poke
V-ing form
I cannot be poking you cannot be poking she cannot be poking we cannot be poking you cannot be poking they cannot be poking
Perfect
I cannot have poked you cannot have poked she cannot have poked we cannot have poked you cannot have poked they cannot have poked
V-ing perfect
I cannot have been poking you cannot have been poking she cannot have been poking we cannot have been poking you cannot have been poking they cannot 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 I not poke? can you not poke? can she not poke? can we not poke? can you not poke? can they not poke?
V-ing form
can I not be poking? can you not be poking? can she not be poking? can we not be poking? can you not be poking? can they not be poking?
Perfect
can I not have poked? can you not have poked? can she not have poked? can we not have poked? can you not have poked? can they not have poked?
V-ing perfect
can I not have been poking? can you not have been poking? can she not have been poking? can we not have been poking? can you not have been poking? can they not have been poking?