I could bristle you could bristle he could bristle we could bristle you could bristle they could bristle
V-ing form
I could be bristling you could be bristling he could be bristling we could be bristling you could be bristling they could be bristling
Perfect
I could have bristled you could have bristled he could have bristled we could have bristled you could have bristled they could have bristled
V-ing perfect
I could have been bristling you could have been bristling he could have been bristling we could have been bristling you could have been bristling they could have been bristling
Negation
Simple form
I could not bristle you could not bristle he could not bristle we could not bristle you could not bristle they could not bristle
V-ing form
I could not be bristling you could not be bristling he could not be bristling we could not be bristling you could not be bristling they could not be bristling
Perfect
I could not have bristled you could not have bristled he could not have bristled we could not have bristled you could not have bristled they could not have bristled
V-ing perfect
I could not have been bristling you could not have been bristling he could not have been bristling we could not have been bristling you could not have been bristling they could not have been bristling
Interrogative form
Simple form
could I bristle? could you bristle? could he bristle? could we bristle? could you bristle? could they bristle?
V-ing form
could I be bristling? could you be bristling? could he be bristling? could we be bristling? could you be bristling? could they be bristling?
Perfect
could I have bristled? could you have bristled? could he have bristled? could we have bristled? could you have bristled? could they have bristled?
V-ing perfect
could I have been bristling? could you have been bristling? could he have been bristling? could we have been bristling? could you have been bristling? could they have been bristling?
Interro-negative form
Simple form
could I not bristle? could you not bristle? could he not bristle? could we not bristle? could you not bristle? could they not bristle?
V-ing form
could I not be bristling? could you not be bristling? could he not be bristling? could we not be bristling? could you not be bristling? could they not be bristling?
Perfect
could I not have bristled? could you not have bristled? could he not have bristled? could we not have bristled? could you not have bristled? could they not have bristled?
V-ing perfect
could I not have been bristling? could you not have been bristling? could he not have been bristling? could we not have been bristling? could you not have been bristling? could they not have been bristling?