I can feed you can feed he can feed we can feed you can feed they can feed
V-ing form
I can be feeding you can be feeding he can be feeding we can be feeding you can be feeding they can be feeding
Perfect
I can have fed you can have fed he can have fed we can have fed you can have fed they can have fed
V-ing perfect
I can have been feeding you can have been feeding he can have been feeding we can have been feeding you can have been feeding they can have been feeding
Negation
Simple form
I can't feed you can't feed he can't feed we can't feed you can't feed they can't feed
V-ing form
I can't be feeding you can't be feeding he can't be feeding we can't be feeding you can't be feeding they can't be feeding
Perfect
I can't have fed you can't have fed he can't have fed we can't have fed you can't have fed they can't have fed
V-ing perfect
I can't have been feeding you can't have been feeding he can't have been feeding we can't have been feeding you can't have been feeding they can't have been feeding
Interrogative form
Simple form
can I feed? can you feed? can he feed? can we feed? can you feed? can they feed?
V-ing form
can I be feeding? can you be feeding? can he be feeding? can we be feeding? can you be feeding? can they be feeding?
Perfect
can I have fed? can you have fed? can he have fed? can we have fed? can you have fed? can they have fed?
V-ing perfect
can I have been feeding? can you have been feeding? can he have been feeding? can we have been feeding? can you have been feeding? can they have been feeding?
Interro-negative form
Simple form
can't I feed? can't you feed? can't he feed? can't we feed? can't you feed? can't they feed?
V-ing form
can't I be feeding? can't you be feeding? can't he be feeding? can't we be feeding? can't you be feeding? can't they be feeding?
Perfect
can't I have fed? can't you have fed? can't he have fed? can't we have fed? can't you have fed? can't they have fed?
V-ing perfect
can't I have been feeding? can't you have been feeding? can't he have been feeding? can't we have been feeding? can't you have been feeding? can't they have been feeding?