I can sugar you can sugar he can sugar we can sugar you can sugar they can sugar
V-ing form
I can be sugaring you can be sugaring he can be sugaring we can be sugaring you can be sugaring they can be sugaring
Perfect
I can have sugared you can have sugared he can have sugared we can have sugared you can have sugared they can have sugared
V-ing perfect
I can have been sugaring you can have been sugaring he can have been sugaring we can have been sugaring you can have been sugaring they can have been sugaring
Negation
Simple form
I cannot sugar you cannot sugar he cannot sugar we cannot sugar you cannot sugar they cannot sugar
V-ing form
I cannot be sugaring you cannot be sugaring he cannot be sugaring we cannot be sugaring you cannot be sugaring they cannot be sugaring
Perfect
I cannot have sugared you cannot have sugared he cannot have sugared we cannot have sugared you cannot have sugared they cannot have sugared
V-ing perfect
I cannot have been sugaring you cannot have been sugaring he cannot have been sugaring we cannot have been sugaring you cannot have been sugaring they cannot have been sugaring
Interrogative form
Simple form
can I sugar? can you sugar? can he sugar? can we sugar? can you sugar? can they sugar?
V-ing form
can I be sugaring? can you be sugaring? can he be sugaring? can we be sugaring? can you be sugaring? can they be sugaring?
Perfect
can I have sugared? can you have sugared? can he have sugared? can we have sugared? can you have sugared? can they have sugared?
V-ing perfect
can I have been sugaring? can you have been sugaring? can he have been sugaring? can we have been sugaring? can you have been sugaring? can they have been sugaring?
Interro-negative form
Simple form
can I not sugar? can you not sugar? can he not sugar? can we not sugar? can you not sugar? can they not sugar?
V-ing form
can I not be sugaring? can you not be sugaring? can he not be sugaring? can we not be sugaring? can you not be sugaring? can they not be sugaring?
Perfect
can I not have sugared? can you not have sugared? can he not have sugared? can we not have sugared? can you not have sugared? can they not have sugared?
V-ing perfect
can I not have been sugaring? can you not have been sugaring? can he not have been sugaring? can we not have been sugaring? can you not have been sugaring? can they not have been sugaring?