I can aid you can aid he can aid we can aid you can aid they can aid
V-ing form
I can be aiding you can be aiding he can be aiding we can be aiding you can be aiding they can be aiding
Perfect
I can have aided you can have aided he can have aided we can have aided you can have aided they can have aided
V-ing perfect
I can have been aiding you can have been aiding he can have been aiding we can have been aiding you can have been aiding they can have been aiding
Negation
Simple form
I can't aid you can't aid he can't aid we can't aid you can't aid they can't aid
V-ing form
I can't be aiding you can't be aiding he can't be aiding we can't be aiding you can't be aiding they can't be aiding
Perfect
I can't have aided you can't have aided he can't have aided we can't have aided you can't have aided they can't have aided
V-ing perfect
I can't have been aiding you can't have been aiding he can't have been aiding we can't have been aiding you can't have been aiding they can't have been aiding
Interrogative form
Simple form
can I aid? can you aid? can he aid? can we aid? can you aid? can they aid?
V-ing form
can I be aiding? can you be aiding? can he be aiding? can we be aiding? can you be aiding? can they be aiding?
Perfect
can I have aided? can you have aided? can he have aided? can we have aided? can you have aided? can they have aided?
V-ing perfect
can I have been aiding? can you have been aiding? can he have been aiding? can we have been aiding? can you have been aiding? can they have been aiding?
Interro-negative form
Simple form
can't I aid? can't you aid? can't he aid? can't we aid? can't you aid? can't they aid?
V-ing form
can't I be aiding? can't you be aiding? can't he be aiding? can't we be aiding? can't you be aiding? can't they be aiding?
Perfect
can't I have aided? can't you have aided? can't he have aided? can't we have aided? can't you have aided? can't they have aided?
V-ing perfect
can't I have been aiding? can't you have been aiding? can't he have been aiding? can't we have been aiding? can't you have been aiding? can't they have been aiding?