I can round you can round he can round we can round you can round they can round
V-ing form
I can be rounding you can be rounding he can be rounding we can be rounding you can be rounding they can be rounding
Perfect
I can have rounded you can have rounded he can have rounded we can have rounded you can have rounded they can have rounded
V-ing perfect
I can have been rounding you can have been rounding he can have been rounding we can have been rounding you can have been rounding they can have been rounding
Negation
Simple form
I can't round you can't round he can't round we can't round you can't round they can't round
V-ing form
I can't be rounding you can't be rounding he can't be rounding we can't be rounding you can't be rounding they can't be rounding
Perfect
I can't have rounded you can't have rounded he can't have rounded we can't have rounded you can't have rounded they can't have rounded
V-ing perfect
I can't have been rounding you can't have been rounding he can't have been rounding we can't have been rounding you can't have been rounding they can't have been rounding
Interrogative form
Simple form
can I round? can you round? can he round? can we round? can you round? can they round?
V-ing form
can I be rounding? can you be rounding? can he be rounding? can we be rounding? can you be rounding? can they be rounding?
Perfect
can I have rounded? can you have rounded? can he have rounded? can we have rounded? can you have rounded? can they have rounded?
V-ing perfect
can I have been rounding? can you have been rounding? can he have been rounding? can we have been rounding? can you have been rounding? can they have been rounding?
Interro-negative form
Simple form
can't I round? can't you round? can't he round? can't we round? can't you round? can't they round?
V-ing form
can't I be rounding? can't you be rounding? can't he be rounding? can't we be rounding? can't you be rounding? can't they be rounding?
Perfect
can't I have rounded? can't you have rounded? can't he have rounded? can't we have rounded? can't you have rounded? can't they have rounded?
V-ing perfect
can't I have been rounding? can't you have been rounding? can't he have been rounding? can't we have been rounding? can't you have been rounding? can't they have been rounding?