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 cannot feed you cannot feed he cannot feed we cannot feed you cannot feed they cannot feed
V-ing form
I cannot be feeding you cannot be feeding he cannot be feeding we cannot be feeding you cannot be feeding they cannot be feeding
Perfect
I cannot have fed you cannot have fed he cannot have fed we cannot have fed you cannot have fed they cannot have fed
V-ing perfect
I cannot have been feeding you cannot have been feeding he cannot have been feeding we cannot have been feeding you cannot have been feeding they cannot 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 I not feed? can you not feed? can he not feed? can we not feed? can you not feed? can they not feed?
V-ing form
can I not be feeding? can you not be feeding? can he not be feeding? can we not be feeding? can you not be feeding? can they not be feeding?
Perfect
can I not have fed? can you not have fed? can he not have fed? can we not have fed? can you not have fed? can they not have fed?
V-ing perfect
can I not have been feeding? can you not have been feeding? can he not have been feeding? can we not have been feeding? can you not have been feeding? can they not have been feeding?