I could doodle you could doodle he could doodle we could doodle you could doodle they could doodle
V-ing form
I could be doodling you could be doodling he could be doodling we could be doodling you could be doodling they could be doodling
Perfect
I could have doodled you could have doodled he could have doodled we could have doodled you could have doodled they could have doodled
V-ing perfect
I could have been doodling you could have been doodling he could have been doodling we could have been doodling you could have been doodling they could have been doodling
Negation
Simple form
I could not doodle you could not doodle he could not doodle we could not doodle you could not doodle they could not doodle
V-ing form
I could not be doodling you could not be doodling he could not be doodling we could not be doodling you could not be doodling they could not be doodling
Perfect
I could not have doodled you could not have doodled he could not have doodled we could not have doodled you could not have doodled they could not have doodled
V-ing perfect
I could not have been doodling you could not have been doodling he could not have been doodling we could not have been doodling you could not have been doodling they could not have been doodling
Interrogative form
Simple form
could I doodle? could you doodle? could he doodle? could we doodle? could you doodle? could they doodle?
V-ing form
could I be doodling? could you be doodling? could he be doodling? could we be doodling? could you be doodling? could they be doodling?
Perfect
could I have doodled? could you have doodled? could he have doodled? could we have doodled? could you have doodled? could they have doodled?
V-ing perfect
could I have been doodling? could you have been doodling? could he have been doodling? could we have been doodling? could you have been doodling? could they have been doodling?
Interro-negative form
Simple form
could I not doodle? could you not doodle? could he not doodle? could we not doodle? could you not doodle? could they not doodle?
V-ing form
could I not be doodling? could you not be doodling? could he not be doodling? could we not be doodling? could you not be doodling? could they not be doodling?
Perfect
could I not have doodled? could you not have doodled? could he not have doodled? could we not have doodled? could you not have doodled? could they not have doodled?
V-ing perfect
could I not have been doodling? could you not have been doodling? could he not have been doodling? could we not have been doodling? could you not have been doodling? could they not have been doodling?