I can suffocate you can suffocate he can suffocate we can suffocate you can suffocate they can suffocate
V-ing form
I can be suffocating you can be suffocating he can be suffocating we can be suffocating you can be suffocating they can be suffocating
Perfect
I can have suffocated you can have suffocated he can have suffocated we can have suffocated you can have suffocated they can have suffocated
V-ing perfect
I can have been suffocating you can have been suffocating he can have been suffocating we can have been suffocating you can have been suffocating they can have been suffocating
Negation
Simple form
I can't suffocate you can't suffocate he can't suffocate we can't suffocate you can't suffocate they can't suffocate
V-ing form
I can't be suffocating you can't be suffocating he can't be suffocating we can't be suffocating you can't be suffocating they can't be suffocating
Perfect
I can't have suffocated you can't have suffocated he can't have suffocated we can't have suffocated you can't have suffocated they can't have suffocated
V-ing perfect
I can't have been suffocating you can't have been suffocating he can't have been suffocating we can't have been suffocating you can't have been suffocating they can't have been suffocating
Interrogative form
Simple form
can I suffocate? can you suffocate? can he suffocate? can we suffocate? can you suffocate? can they suffocate?
V-ing form
can I be suffocating? can you be suffocating? can he be suffocating? can we be suffocating? can you be suffocating? can they be suffocating?
Perfect
can I have suffocated? can you have suffocated? can he have suffocated? can we have suffocated? can you have suffocated? can they have suffocated?
V-ing perfect
can I have been suffocating? can you have been suffocating? can he have been suffocating? can we have been suffocating? can you have been suffocating? can they have been suffocating?
Interro-negative form
Simple form
can't I suffocate? can't you suffocate? can't he suffocate? can't we suffocate? can't you suffocate? can't they suffocate?
V-ing form
can't I be suffocating? can't you be suffocating? can't he be suffocating? can't we be suffocating? can't you be suffocating? can't they be suffocating?
Perfect
can't I have suffocated? can't you have suffocated? can't he have suffocated? can't we have suffocated? can't you have suffocated? can't they have suffocated?
V-ing perfect
can't I have been suffocating? can't you have been suffocating? can't he have been suffocating? can't we have been suffocating? can't you have been suffocating? can't they have been suffocating?