I can choke you can choke he can choke we can choke you can choke they can choke
V-ing form
I can be choking you can be choking he can be choking we can be choking you can be choking they can be choking
Perfect
I can have choked you can have choked he can have choked we can have choked you can have choked they can have choked
V-ing perfect
I can have been choking you can have been choking he can have been choking we can have been choking you can have been choking they can have been choking
Negation
Simple form
I cannot choke you cannot choke he cannot choke we cannot choke you cannot choke they cannot choke
V-ing form
I cannot be choking you cannot be choking he cannot be choking we cannot be choking you cannot be choking they cannot be choking
Perfect
I cannot have choked you cannot have choked he cannot have choked we cannot have choked you cannot have choked they cannot have choked
V-ing perfect
I cannot have been choking you cannot have been choking he cannot have been choking we cannot have been choking you cannot have been choking they cannot have been choking
Interrogative form
Simple form
can I choke? can you choke? can he choke? can we choke? can you choke? can they choke?
V-ing form
can I be choking? can you be choking? can he be choking? can we be choking? can you be choking? can they be choking?
Perfect
can I have choked? can you have choked? can he have choked? can we have choked? can you have choked? can they have choked?
V-ing perfect
can I have been choking? can you have been choking? can he have been choking? can we have been choking? can you have been choking? can they have been choking?
Interro-negative form
Simple form
can I not choke? can you not choke? can he not choke? can we not choke? can you not choke? can they not choke?
V-ing form
can I not be choking? can you not be choking? can he not be choking? can we not be choking? can you not be choking? can they not be choking?
Perfect
can I not have choked? can you not have choked? can he not have choked? can we not have choked? can you not have choked? can they not have choked?
V-ing perfect
can I not have been choking? can you not have been choking? can he not have been choking? can we not have been choking? can you not have been choking? can they not have been choking?