I could cloud you could cloud he could cloud we could cloud you could cloud they could cloud
V-ing form
I could be clouding you could be clouding he could be clouding we could be clouding you could be clouding they could be clouding
Perfect
I could have clouded you could have clouded he could have clouded we could have clouded you could have clouded they could have clouded
V-ing perfect
I could have been clouding you could have been clouding he could have been clouding we could have been clouding you could have been clouding they could have been clouding
Negation
Simple form
I could not cloud you could not cloud he could not cloud we could not cloud you could not cloud they could not cloud
V-ing form
I could not be clouding you could not be clouding he could not be clouding we could not be clouding you could not be clouding they could not be clouding
Perfect
I could not have clouded you could not have clouded he could not have clouded we could not have clouded you could not have clouded they could not have clouded
V-ing perfect
I could not have been clouding you could not have been clouding he could not have been clouding we could not have been clouding you could not have been clouding they could not have been clouding
Interrogative form
Simple form
could I cloud? could you cloud? could he cloud? could we cloud? could you cloud? could they cloud?
V-ing form
could I be clouding? could you be clouding? could he be clouding? could we be clouding? could you be clouding? could they be clouding?
Perfect
could I have clouded? could you have clouded? could he have clouded? could we have clouded? could you have clouded? could they have clouded?
V-ing perfect
could I have been clouding? could you have been clouding? could he have been clouding? could we have been clouding? could you have been clouding? could they have been clouding?
Interro-negative form
Simple form
could I not cloud? could you not cloud? could he not cloud? could we not cloud? could you not cloud? could they not cloud?
V-ing form
could I not be clouding? could you not be clouding? could he not be clouding? could we not be clouding? could you not be clouding? could they not be clouding?
Perfect
could I not have clouded? could you not have clouded? could he not have clouded? could we not have clouded? could you not have clouded? could they not have clouded?
V-ing perfect
could I not have been clouding? could you not have been clouding? could he not have been clouding? could we not have been clouding? could you not have been clouding? could they not have been clouding?