I could clap you could clap he could clap we could clap you could clap they could clap
V-ing form
I could be clapping you could be clapping he could be clapping we could be clapping you could be clapping they could be clapping
Perfect
I could have clapped you could have clapped he could have clapped we could have clapped you could have clapped they could have clapped
V-ing perfect
I could have been clapping you could have been clapping he could have been clapping we could have been clapping you could have been clapping they could have been clapping
Negation
Simple form
I could not clap you could not clap he could not clap we could not clap you could not clap they could not clap
V-ing form
I could not be clapping you could not be clapping he could not be clapping we could not be clapping you could not be clapping they could not be clapping
Perfect
I could not have clapped you could not have clapped he could not have clapped we could not have clapped you could not have clapped they could not have clapped
V-ing perfect
I could not have been clapping you could not have been clapping he could not have been clapping we could not have been clapping you could not have been clapping they could not have been clapping
Interrogative form
Simple form
could I clap? could you clap? could he clap? could we clap? could you clap? could they clap?
V-ing form
could I be clapping? could you be clapping? could he be clapping? could we be clapping? could you be clapping? could they be clapping?
Perfect
could I have clapped? could you have clapped? could he have clapped? could we have clapped? could you have clapped? could they have clapped?
V-ing perfect
could I have been clapping? could you have been clapping? could he have been clapping? could we have been clapping? could you have been clapping? could they have been clapping?
Interro-negative form
Simple form
could I not clap? could you not clap? could he not clap? could we not clap? could you not clap? could they not clap?
V-ing form
could I not be clapping? could you not be clapping? could he not be clapping? could we not be clapping? could you not be clapping? could they not be clapping?
Perfect
could I not have clapped? could you not have clapped? could he not have clapped? could we not have clapped? could you not have clapped? could they not have clapped?
V-ing perfect
could I not have been clapping? could you not have been clapping? could he not have been clapping? could we not have been clapping? could you not have been clapping? could they not have been clapping?