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 can't gobble you can't gobble he can't gobble we can't gobble you can't gobble they can't gobble
V-ing form
I can't be gobbling you can't be gobbling he can't be gobbling we can't be gobbling you can't be gobbling they can't be gobbling
Perfect
I can't have gobbled you can't have gobbled he can't have gobbled we can't have gobbled you can't have gobbled they can't have gobbled
V-ing perfect
I can't have been gobbling you can't have been gobbling he can't have been gobbling we can't have been gobbling you can't have been gobbling they can't 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't I gobble? can't you gobble? can't he gobble? can't we gobble? can't you gobble? can't they gobble?
V-ing form
can't I be gobbling? can't you be gobbling? can't he be gobbling? can't we be gobbling? can't you be gobbling? can't they be gobbling?
Perfect
can't I have gobbled? can't you have gobbled? can't he have gobbled? can't we have gobbled? can't you have gobbled? can't they have gobbled?
V-ing perfect
can't I have been gobbling? can't you have been gobbling? can't he have been gobbling? can't we have been gobbling? can't you have been gobbling? can't they have been gobbling?