I could treadle you could treadle he could treadle we could treadle you could treadle they could treadle
V-ing form
I could be treadling you could be treadling he could be treadling we could be treadling you could be treadling they could be treadling
Perfect
I could have treadled you could have treadled he could have treadled we could have treadled you could have treadled they could have treadled
V-ing perfect
I could have been treadling you could have been treadling he could have been treadling we could have been treadling you could have been treadling they could have been treadling
Negation
Simple form
I could not treadle you could not treadle he could not treadle we could not treadle you could not treadle they could not treadle
V-ing form
I could not be treadling you could not be treadling he could not be treadling we could not be treadling you could not be treadling they could not be treadling
Perfect
I could not have treadled you could not have treadled he could not have treadled we could not have treadled you could not have treadled they could not have treadled
V-ing perfect
I could not have been treadling you could not have been treadling he could not have been treadling we could not have been treadling you could not have been treadling they could not have been treadling
Interrogative form
Simple form
could I treadle? could you treadle? could he treadle? could we treadle? could you treadle? could they treadle?
V-ing form
could I be treadling? could you be treadling? could he be treadling? could we be treadling? could you be treadling? could they be treadling?
Perfect
could I have treadled? could you have treadled? could he have treadled? could we have treadled? could you have treadled? could they have treadled?
V-ing perfect
could I have been treadling? could you have been treadling? could he have been treadling? could we have been treadling? could you have been treadling? could they have been treadling?
Interro-negative form
Simple form
could I not treadle? could you not treadle? could he not treadle? could we not treadle? could you not treadle? could they not treadle?
V-ing form
could I not be treadling? could you not be treadling? could he not be treadling? could we not be treadling? could you not be treadling? could they not be treadling?
Perfect
could I not have treadled? could you not have treadled? could he not have treadled? could we not have treadled? could you not have treadled? could they not have treadled?
V-ing perfect
could I not have been treadling? could you not have been treadling? could he not have been treadling? could we not have been treadling? could you not have been treadling? could they not have been treadling?