I can separate you can separate he can separate we can separate you can separate they can separate
V-ing form
I can be separating you can be separating he can be separating we can be separating you can be separating they can be separating
Perfect
I can have separated you can have separated he can have separated we can have separated you can have separated they can have separated
V-ing perfect
I can have been separating you can have been separating he can have been separating we can have been separating you can have been separating they can have been separating
Negation
Simple form
I can't separate you can't separate he can't separate we can't separate you can't separate they can't separate
V-ing form
I can't be separating you can't be separating he can't be separating we can't be separating you can't be separating they can't be separating
Perfect
I can't have separated you can't have separated he can't have separated we can't have separated you can't have separated they can't have separated
V-ing perfect
I can't have been separating you can't have been separating he can't have been separating we can't have been separating you can't have been separating they can't have been separating
Interrogative form
Simple form
can I separate? can you separate? can he separate? can we separate? can you separate? can they separate?
V-ing form
can I be separating? can you be separating? can he be separating? can we be separating? can you be separating? can they be separating?
Perfect
can I have separated? can you have separated? can he have separated? can we have separated? can you have separated? can they have separated?
V-ing perfect
can I have been separating? can you have been separating? can he have been separating? can we have been separating? can you have been separating? can they have been separating?
Interro-negative form
Simple form
can't I separate? can't you separate? can't he separate? can't we separate? can't you separate? can't they separate?
V-ing form
can't I be separating? can't you be separating? can't he be separating? can't we be separating? can't you be separating? can't they be separating?
Perfect
can't I have separated? can't you have separated? can't he have separated? can't we have separated? can't you have separated? can't they have separated?
V-ing perfect
can't I have been separating? can't you have been separating? can't he have been separating? can't we have been separating? can't you have been separating? can't they have been separating?