I could cloud you could cloud she could cloud we could cloud you could cloud they could cloud
V-ing form
I could be clouding you could be clouding she could be clouding we could be clouding you could be clouding they could be clouding
Perfect
I could have clouded you could have clouded she 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 she could have been clouding we could have been clouding you could have been clouding they could have been clouding
Negation
Simple form
I couldn't cloud you couldn't cloud she couldn't cloud we couldn't cloud you couldn't cloud they couldn't cloud
V-ing form
I couldn't be clouding you couldn't be clouding she couldn't be clouding we couldn't be clouding you couldn't be clouding they couldn't be clouding
Perfect
I couldn't have clouded you couldn't have clouded she couldn't have clouded we couldn't have clouded you couldn't have clouded they couldn't have clouded
V-ing perfect
I couldn't have been clouding you couldn't have been clouding she couldn't have been clouding we couldn't have been clouding you couldn't have been clouding they couldn't have been clouding
Interrogative form
Simple form
could I cloud? could you cloud? could she cloud? could we cloud? could you cloud? could they cloud?
V-ing form
could I be clouding? could you be clouding? could she be clouding? could we be clouding? could you be clouding? could they be clouding?
Perfect
could I have clouded? could you have clouded? could she 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 she have been clouding? could we have been clouding? could you have been clouding? could they have been clouding?
Interro-negative form
Simple form
couldn't I cloud? couldn't you cloud? couldn't she cloud? couldn't we cloud? couldn't you cloud? couldn't they cloud?
V-ing form
couldn't I be clouding? couldn't you be clouding? couldn't she be clouding? couldn't we be clouding? couldn't you be clouding? couldn't they be clouding?
Perfect
couldn't I have clouded? couldn't you have clouded? couldn't she have clouded? couldn't we have clouded? couldn't you have clouded? couldn't they have clouded?
V-ing perfect
couldn't I have been clouding? couldn't you have been clouding? couldn't she have been clouding? couldn't we have been clouding? couldn't you have been clouding? couldn't they have been clouding?