I can burrow you can burrow he can burrow we can burrow you can burrow they can burrow
V-ing form
I can be burrowing you can be burrowing he can be burrowing we can be burrowing you can be burrowing they can be burrowing
Perfect
I can have burrowed you can have burrowed he can have burrowed we can have burrowed you can have burrowed they can have burrowed
V-ing perfect
I can have been burrowing you can have been burrowing he can have been burrowing we can have been burrowing you can have been burrowing they can have been burrowing
Negation
Simple form
I cannot burrow you cannot burrow he cannot burrow we cannot burrow you cannot burrow they cannot burrow
V-ing form
I cannot be burrowing you cannot be burrowing he cannot be burrowing we cannot be burrowing you cannot be burrowing they cannot be burrowing
Perfect
I cannot have burrowed you cannot have burrowed he cannot have burrowed we cannot have burrowed you cannot have burrowed they cannot have burrowed
V-ing perfect
I cannot have been burrowing you cannot have been burrowing he cannot have been burrowing we cannot have been burrowing you cannot have been burrowing they cannot have been burrowing
Interrogative form
Simple form
can I burrow? can you burrow? can he burrow? can we burrow? can you burrow? can they burrow?
V-ing form
can I be burrowing? can you be burrowing? can he be burrowing? can we be burrowing? can you be burrowing? can they be burrowing?
Perfect
can I have burrowed? can you have burrowed? can he have burrowed? can we have burrowed? can you have burrowed? can they have burrowed?
V-ing perfect
can I have been burrowing? can you have been burrowing? can he have been burrowing? can we have been burrowing? can you have been burrowing? can they have been burrowing?
Interro-negative form
Simple form
can I not burrow? can you not burrow? can he not burrow? can we not burrow? can you not burrow? can they not burrow?
V-ing form
can I not be burrowing? can you not be burrowing? can he not be burrowing? can we not be burrowing? can you not be burrowing? can they not be burrowing?
Perfect
can I not have burrowed? can you not have burrowed? can he not have burrowed? can we not have burrowed? can you not have burrowed? can they not have burrowed?
V-ing perfect
can I not have been burrowing? can you not have been burrowing? can he not have been burrowing? can we not have been burrowing? can you not have been burrowing? can they not have been burrowing?