I can watch you can watch she can watch we can watch you can watch they can watch
V-ing form
I can be watching you can be watching she can be watching we can be watching you can be watching they can be watching
Perfect
I can have watched you can have watched she can have watched we can have watched you can have watched they can have watched
V-ing perfect
I can have been watching you can have been watching she can have been watching we can have been watching you can have been watching they can have been watching
Negation
Simple form
I can't watch you can't watch she can't watch we can't watch you can't watch they can't watch
V-ing form
I can't be watching you can't be watching she can't be watching we can't be watching you can't be watching they can't be watching
Perfect
I can't have watched you can't have watched she can't have watched we can't have watched you can't have watched they can't have watched
V-ing perfect
I can't have been watching you can't have been watching she can't have been watching we can't have been watching you can't have been watching they can't have been watching
Interrogative form
Simple form
can I watch? can you watch? can she watch? can we watch? can you watch? can they watch?
V-ing form
can I be watching? can you be watching? can she be watching? can we be watching? can you be watching? can they be watching?
Perfect
can I have watched? can you have watched? can she have watched? can we have watched? can you have watched? can they have watched?
V-ing perfect
can I have been watching? can you have been watching? can she have been watching? can we have been watching? can you have been watching? can they have been watching?
Interro-negative form
Simple form
can't I watch? can't you watch? can't she watch? can't we watch? can't you watch? can't they watch?
V-ing form
can't I be watching? can't you be watching? can't she be watching? can't we be watching? can't you be watching? can't they be watching?
Perfect
can't I have watched? can't you have watched? can't she have watched? can't we have watched? can't you have watched? can't they have watched?
V-ing perfect
can't I have been watching? can't you have been watching? can't she have been watching? can't we have been watching? can't you have been watching? can't they have been watching?