I could brittle you could brittle she could brittle we could brittle you could brittle they could brittle
V-ing form
I could be brittling you could be brittling she could be brittling we could be brittling you could be brittling they could be brittling
Perfect
I could have brittled you could have brittled she could have brittled we could have brittled you could have brittled they could have brittled
V-ing perfect
I could have been brittling you could have been brittling she could have been brittling we could have been brittling you could have been brittling they could have been brittling
Negation
Simple form
I could not brittle you could not brittle she could not brittle we could not brittle you could not brittle they could not brittle
V-ing form
I could not be brittling you could not be brittling she could not be brittling we could not be brittling you could not be brittling they could not be brittling
Perfect
I could not have brittled you could not have brittled she could not have brittled we could not have brittled you could not have brittled they could not have brittled
V-ing perfect
I could not have been brittling you could not have been brittling she could not have been brittling we could not have been brittling you could not have been brittling they could not have been brittling
Interrogative form
Simple form
could I brittle? could you brittle? could she brittle? could we brittle? could you brittle? could they brittle?
V-ing form
could I be brittling? could you be brittling? could she be brittling? could we be brittling? could you be brittling? could they be brittling?
Perfect
could I have brittled? could you have brittled? could she have brittled? could we have brittled? could you have brittled? could they have brittled?
V-ing perfect
could I have been brittling? could you have been brittling? could she have been brittling? could we have been brittling? could you have been brittling? could they have been brittling?
Interro-negative form
Simple form
could I not brittle? could you not brittle? could she not brittle? could we not brittle? could you not brittle? could they not brittle?
V-ing form
could I not be brittling? could you not be brittling? could she not be brittling? could we not be brittling? could you not be brittling? could they not be brittling?
Perfect
could I not have brittled? could you not have brittled? could she not have brittled? could we not have brittled? could you not have brittled? could they not have brittled?
V-ing perfect
could I not have been brittling? could you not have been brittling? could she not have been brittling? could we not have been brittling? could you not have been brittling? could they not have been brittling?