I can refill you can refill he can refill we can refill you can refill they can refill
V-ing form
I can be refilling you can be refilling he can be refilling we can be refilling you can be refilling they can be refilling
Perfect
I can have refilled you can have refilled he can have refilled we can have refilled you can have refilled they can have refilled
V-ing perfect
I can have been refilling you can have been refilling he can have been refilling we can have been refilling you can have been refilling they can have been refilling
Negation
Simple form
I can't refill you can't refill he can't refill we can't refill you can't refill they can't refill
V-ing form
I can't be refilling you can't be refilling he can't be refilling we can't be refilling you can't be refilling they can't be refilling
Perfect
I can't have refilled you can't have refilled he can't have refilled we can't have refilled you can't have refilled they can't have refilled
V-ing perfect
I can't have been refilling you can't have been refilling he can't have been refilling we can't have been refilling you can't have been refilling they can't have been refilling
Interrogative form
Simple form
can I refill? can you refill? can he refill? can we refill? can you refill? can they refill?
V-ing form
can I be refilling? can you be refilling? can he be refilling? can we be refilling? can you be refilling? can they be refilling?
Perfect
can I have refilled? can you have refilled? can he have refilled? can we have refilled? can you have refilled? can they have refilled?
V-ing perfect
can I have been refilling? can you have been refilling? can he have been refilling? can we have been refilling? can you have been refilling? can they have been refilling?
Interro-negative form
Simple form
can't I refill? can't you refill? can't he refill? can't we refill? can't you refill? can't they refill?
V-ing form
can't I be refilling? can't you be refilling? can't he be refilling? can't we be refilling? can't you be refilling? can't they be refilling?
Perfect
can't I have refilled? can't you have refilled? can't he have refilled? can't we have refilled? can't you have refilled? can't they have refilled?
V-ing perfect
can't I have been refilling? can't you have been refilling? can't he have been refilling? can't we have been refilling? can't you have been refilling? can't they have been refilling?