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 cannot watch you cannot watch she cannot watch we cannot watch you cannot watch they cannot watch
V-ing form
I cannot be watching you cannot be watching she cannot be watching we cannot be watching you cannot be watching they cannot be watching
Perfect
I cannot have watched you cannot have watched she cannot have watched we cannot have watched you cannot have watched they cannot have watched
V-ing perfect
I cannot have been watching you cannot have been watching she cannot have been watching we cannot have been watching you cannot have been watching they cannot 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 I not watch? can you not watch? can she not watch? can we not watch? can you not watch? can they not watch?
V-ing form
can I not be watching? can you not be watching? can she not be watching? can we not be watching? can you not be watching? can they not be watching?
Perfect
can I not have watched? can you not have watched? can she not have watched? can we not have watched? can you not have watched? can they not have watched?
V-ing perfect
can I not have been watching? can you not have been watching? can she not have been watching? can we not have been watching? can you not have been watching? can they not have been watching?