I can gobble you can gobble he can gobble we can gobble you can gobble they can gobble
V-ing form
I can be gobbling you can be gobbling he can be gobbling we can be gobbling you can be gobbling they can be gobbling
Perfect
I can have gobbled you can have gobbled he can have gobbled we can have gobbled you can have gobbled they can have gobbled
V-ing perfect
I can have been gobbling you can have been gobbling he can have been gobbling we can have been gobbling you can have been gobbling they can have been gobbling
Negation
Simple form
I cannot gobble you cannot gobble he cannot gobble we cannot gobble you cannot gobble they cannot gobble
V-ing form
I cannot be gobbling you cannot be gobbling he cannot be gobbling we cannot be gobbling you cannot be gobbling they cannot be gobbling
Perfect
I cannot have gobbled you cannot have gobbled he cannot have gobbled we cannot have gobbled you cannot have gobbled they cannot have gobbled
V-ing perfect
I cannot have been gobbling you cannot have been gobbling he cannot have been gobbling we cannot have been gobbling you cannot have been gobbling they cannot have been gobbling
Interrogative form
Simple form
can I gobble? can you gobble? can he gobble? can we gobble? can you gobble? can they gobble?
V-ing form
can I be gobbling? can you be gobbling? can he be gobbling? can we be gobbling? can you be gobbling? can they be gobbling?
Perfect
can I have gobbled? can you have gobbled? can he have gobbled? can we have gobbled? can you have gobbled? can they have gobbled?
V-ing perfect
can I have been gobbling? can you have been gobbling? can he have been gobbling? can we have been gobbling? can you have been gobbling? can they have been gobbling?
Interro-negative form
Simple form
can I not gobble? can you not gobble? can he not gobble? can we not gobble? can you not gobble? can they not gobble?
V-ing form
can I not be gobbling? can you not be gobbling? can he not be gobbling? can we not be gobbling? can you not be gobbling? can they not be gobbling?
Perfect
can I not have gobbled? can you not have gobbled? can he not have gobbled? can we not have gobbled? can you not have gobbled? can they not have gobbled?
V-ing perfect
can I not have been gobbling? can you not have been gobbling? can he not have been gobbling? can we not have been gobbling? can you not have been gobbling? can they not have been gobbling?