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 can't sugar you can't sugar he can't sugar we can't sugar you can't sugar they can't sugar
V-ing form
I can't be sugaring you can't be sugaring he can't be sugaring we can't be sugaring you can't be sugaring they can't be sugaring
Perfect
I can't have sugared you can't have sugared he can't have sugared we can't have sugared you can't have sugared they can't have sugared
V-ing perfect
I can't have been sugaring you can't have been sugaring he can't have been sugaring we can't have been sugaring you can't have been sugaring they can't 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't I sugar? can't you sugar? can't he sugar? can't we sugar? can't you sugar? can't they sugar?
V-ing form
can't I be sugaring? can't you be sugaring? can't he be sugaring? can't we be sugaring? can't you be sugaring? can't they be sugaring?
Perfect
can't I have sugared? can't you have sugared? can't he have sugared? can't we have sugared? can't you have sugared? can't they have sugared?
V-ing perfect
can't I have been sugaring? can't you have been sugaring? can't he have been sugaring? can't we have been sugaring? can't you have been sugaring? can't they have been sugaring?