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 can't mow you can't mow he can't mow we can't mow you can't mow they can't mow
V-ing form
I can't be mowing you can't be mowing he can't be mowing we can't be mowing you can't be mowing they can't be mowing
Perfect
I can't have mown you can't have mown he can't have mown we can't have mown you can't have mown they can't have mown
V-ing perfect
I can't have been mowing you can't have been mowing he can't have been mowing we can't have been mowing you can't have been mowing they can't 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't I mow? can't you mow? can't he mow? can't we mow? can't you mow? can't they mow?
V-ing form
can't I be mowing? can't you be mowing? can't he be mowing? can't we be mowing? can't you be mowing? can't they be mowing?
Perfect
can't I have mown? can't you have mown? can't he have mown? can't we have mown? can't you have mown? can't they have mown?
V-ing perfect
can't I have been mowing? can't you have been mowing? can't he have been mowing? can't we have been mowing? can't you have been mowing? can't they have been mowing?