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 couldn't addle you couldn't addle he couldn't addle we couldn't addle you couldn't addle they couldn't addle
V-ing form
I couldn't be addling you couldn't be addling he couldn't be addling we couldn't be addling you couldn't be addling they couldn't be addling
Perfect
I couldn't have addled you couldn't have addled he couldn't have addled we couldn't have addled you couldn't have addled they couldn't have addled
V-ing perfect
I couldn't have been addling you couldn't have been addling he couldn't have been addling we couldn't have been addling you couldn't have been addling they couldn't 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
couldn't I addle? couldn't you addle? couldn't he addle? couldn't we addle? couldn't you addle? couldn't they addle?
V-ing form
couldn't I be addling? couldn't you be addling? couldn't he be addling? couldn't we be addling? couldn't you be addling? couldn't they be addling?
Perfect
couldn't I have addled? couldn't you have addled? couldn't he have addled? couldn't we have addled? couldn't you have addled? couldn't they have addled?
V-ing perfect
couldn't I have been addling? couldn't you have been addling? couldn't he have been addling? couldn't we have been addling? couldn't you have been addling? couldn't they have been addling?