I could addle you could addle he could addle we could addle you could addle they could addle
V-ing form
I could be addling you could be addling he could be addling we could be addling you could be addling they could be addling
Perfect
I could have addled you could have addled he could have addled we could have addled you could have addled they could have addled
V-ing perfect
I could have been addling you could have been addling he could have been addling we could have been addling you could have been addling they could have been addling
Negation
Simple form
I could not addle you could not addle he could not addle we could not addle you could not addle they could not addle
V-ing form
I could not be addling you could not be addling he could not be addling we could not be addling you could not be addling they could not be addling
Perfect
I could not have addled you could not have addled he could not have addled we could not have addled you could not have addled they could not have addled
V-ing perfect
I could not have been addling you could not have been addling he could not have been addling we could not have been addling you could not have been addling they could not have been addling
Interrogative form
Simple form
could I addle? could you addle? could he addle? could we addle? could you addle? could they addle?
V-ing form
could I be addling? could you be addling? could he be addling? could we be addling? could you be addling? could they be addling?
Perfect
could I have addled? could you have addled? could he have addled? could we have addled? could you have addled? could they have addled?
V-ing perfect
could I have been addling? could you have been addling? could he have been addling? could we have been addling? could you have been addling? could they have been addling?
Interro-negative form
Simple form
could I not addle? could you not addle? could he not addle? could we not addle? could you not addle? could they not addle?
V-ing form
could I not be addling? could you not be addling? could he not be addling? could we not be addling? could you not be addling? could they not be addling?
Perfect
could I not have addled? could you not have addled? could he not have addled? could we not have addled? could you not have addled? could they not have addled?
V-ing perfect
could I not have been addling? could you not have been addling? could he not have been addling? could we not have been addling? could you not have been addling? could they not have been addling?