I can snake you can snake he can snake we can snake you can snake they can snake
V-ing form
I can be snaking you can be snaking he can be snaking we can be snaking you can be snaking they can be snaking
Perfect
I can have snaked you can have snaked he can have snaked we can have snaked you can have snaked they can have snaked
V-ing perfect
I can have been snaking you can have been snaking he can have been snaking we can have been snaking you can have been snaking they can have been snaking
Negation
Simple form
I cannot snake you cannot snake he cannot snake we cannot snake you cannot snake they cannot snake
V-ing form
I cannot be snaking you cannot be snaking he cannot be snaking we cannot be snaking you cannot be snaking they cannot be snaking
Perfect
I cannot have snaked you cannot have snaked he cannot have snaked we cannot have snaked you cannot have snaked they cannot have snaked
V-ing perfect
I cannot have been snaking you cannot have been snaking he cannot have been snaking we cannot have been snaking you cannot have been snaking they cannot have been snaking
Interrogative form
Simple form
can I snake? can you snake? can he snake? can we snake? can you snake? can they snake?
V-ing form
can I be snaking? can you be snaking? can he be snaking? can we be snaking? can you be snaking? can they be snaking?
Perfect
can I have snaked? can you have snaked? can he have snaked? can we have snaked? can you have snaked? can they have snaked?
V-ing perfect
can I have been snaking? can you have been snaking? can he have been snaking? can we have been snaking? can you have been snaking? can they have been snaking?
Interro-negative form
Simple form
can I not snake? can you not snake? can he not snake? can we not snake? can you not snake? can they not snake?
V-ing form
can I not be snaking? can you not be snaking? can he not be snaking? can we not be snaking? can you not be snaking? can they not be snaking?
Perfect
can I not have snaked? can you not have snaked? can he not have snaked? can we not have snaked? can you not have snaked? can they not have snaked?
V-ing perfect
can I not have been snaking? can you not have been snaking? can he not have been snaking? can we not have been snaking? can you not have been snaking? can they not have been snaking?