I could clangor you could clangor he could clangor we could clangor you could clangor they could clangor
V-ing form
I could be clangoring you could be clangoring he could be clangoring we could be clangoring you could be clangoring they could be clangoring
Perfect
I could have clangored you could have clangored he could have clangored we could have clangored you could have clangored they could have clangored
V-ing perfect
I could have been clangoring you could have been clangoring he could have been clangoring we could have been clangoring you could have been clangoring they could have been clangoring
Negation
Simple form
I couldn't clangor you couldn't clangor he couldn't clangor we couldn't clangor you couldn't clangor they couldn't clangor
V-ing form
I couldn't be clangoring you couldn't be clangoring he couldn't be clangoring we couldn't be clangoring you couldn't be clangoring they couldn't be clangoring
Perfect
I couldn't have clangored you couldn't have clangored he couldn't have clangored we couldn't have clangored you couldn't have clangored they couldn't have clangored
V-ing perfect
I couldn't have been clangoring you couldn't have been clangoring he couldn't have been clangoring we couldn't have been clangoring you couldn't have been clangoring they couldn't have been clangoring
Interrogative form
Simple form
could I clangor? could you clangor? could he clangor? could we clangor? could you clangor? could they clangor?
V-ing form
could I be clangoring? could you be clangoring? could he be clangoring? could we be clangoring? could you be clangoring? could they be clangoring?
Perfect
could I have clangored? could you have clangored? could he have clangored? could we have clangored? could you have clangored? could they have clangored?
V-ing perfect
could I have been clangoring? could you have been clangoring? could he have been clangoring? could we have been clangoring? could you have been clangoring? could they have been clangoring?
Interro-negative form
Simple form
couldn't I clangor? couldn't you clangor? couldn't he clangor? couldn't we clangor? couldn't you clangor? couldn't they clangor?
V-ing form
couldn't I be clangoring? couldn't you be clangoring? couldn't he be clangoring? couldn't we be clangoring? couldn't you be clangoring? couldn't they be clangoring?
Perfect
couldn't I have clangored? couldn't you have clangored? couldn't he have clangored? couldn't we have clangored? couldn't you have clangored? couldn't they have clangored?
V-ing perfect
couldn't I have been clangoring? couldn't you have been clangoring? couldn't he have been clangoring? couldn't we have been clangoring? couldn't you have been clangoring? couldn't they have been clangoring?