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 couldn't bristle you couldn't bristle he couldn't bristle we couldn't bristle you couldn't bristle they couldn't bristle
V-ing form
I couldn't be bristling you couldn't be bristling he couldn't be bristling we couldn't be bristling you couldn't be bristling they couldn't be bristling
Perfect
I couldn't have bristled you couldn't have bristled he couldn't have bristled we couldn't have bristled you couldn't have bristled they couldn't have bristled
V-ing perfect
I couldn't have been bristling you couldn't have been bristling he couldn't have been bristling we couldn't have been bristling you couldn't have been bristling they couldn't 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
couldn't I bristle? couldn't you bristle? couldn't he bristle? couldn't we bristle? couldn't you bristle? couldn't they bristle?
V-ing form
couldn't I be bristling? couldn't you be bristling? couldn't he be bristling? couldn't we be bristling? couldn't you be bristling? couldn't they be bristling?
Perfect
couldn't I have bristled? couldn't you have bristled? couldn't he have bristled? couldn't we have bristled? couldn't you have bristled? couldn't they have bristled?
V-ing perfect
couldn't I have been bristling? couldn't you have been bristling? couldn't he have been bristling? couldn't we have been bristling? couldn't you have been bristling? couldn't they have been bristling?