I can mow you can mow he can mow we can mow you can mow they can mow
V-ing form
I can be mowing you can be mowing he can be mowing we can be mowing you can be mowing they can be mowing
Perfect
I can have mown you can have mown he can have mown we can have mown you can have mown they can have mown
V-ing perfect
I can have been mowing you can have been mowing he can have been mowing we can have been mowing you can have been mowing they can have been mowing
Negation
Simple form
I cannot mow you cannot mow he cannot mow we cannot mow you cannot mow they cannot mow
V-ing form
I cannot be mowing you cannot be mowing he cannot be mowing we cannot be mowing you cannot be mowing they cannot be mowing
Perfect
I cannot have mown you cannot have mown he cannot have mown we cannot have mown you cannot have mown they cannot have mown
V-ing perfect
I cannot have been mowing you cannot have been mowing he cannot have been mowing we cannot have been mowing you cannot have been mowing they cannot have been mowing
Interrogative form
Simple form
can I mow? can you mow? can he mow? can we mow? can you mow? can they mow?
V-ing form
can I be mowing? can you be mowing? can he be mowing? can we be mowing? can you be mowing? can they be mowing?
Perfect
can I have mown? can you have mown? can he have mown? can we have mown? can you have mown? can they have mown?
V-ing perfect
can I have been mowing? can you have been mowing? can he have been mowing? can we have been mowing? can you have been mowing? can they have been mowing?
Interro-negative form
Simple form
can I not mow? can you not mow? can he not mow? can we not mow? can you not mow? can they not mow?
V-ing form
can I not be mowing? can you not be mowing? can he not be mowing? can we not be mowing? can you not be mowing? can they not be mowing?
Perfect
can I not have mown? can you not have mown? can he not have mown? can we not have mown? can you not have mown? can they not have mown?
V-ing perfect
can I not have been mowing? can you not have been mowing? can he not have been mowing? can we not have been mowing? can you not have been mowing? can they not have been mowing?