I could bowl you could bowl he could bowl we could bowl you could bowl they could bowl
V-ing form
I could be bowling you could be bowling he could be bowling we could be bowling you could be bowling they could be bowling
Perfect
I could have bowled you could have bowled he could have bowled we could have bowled you could have bowled they could have bowled
V-ing perfect
I could have been bowling you could have been bowling he could have been bowling we could have been bowling you could have been bowling they could have been bowling
Negation
Simple form
I could not bowl you could not bowl he could not bowl we could not bowl you could not bowl they could not bowl
V-ing form
I could not be bowling you could not be bowling he could not be bowling we could not be bowling you could not be bowling they could not be bowling
Perfect
I could not have bowled you could not have bowled he could not have bowled we could not have bowled you could not have bowled they could not have bowled
V-ing perfect
I could not have been bowling you could not have been bowling he could not have been bowling we could not have been bowling you could not have been bowling they could not have been bowling
Interrogative form
Simple form
could I bowl? could you bowl? could he bowl? could we bowl? could you bowl? could they bowl?
V-ing form
could I be bowling? could you be bowling? could he be bowling? could we be bowling? could you be bowling? could they be bowling?
Perfect
could I have bowled? could you have bowled? could he have bowled? could we have bowled? could you have bowled? could they have bowled?
V-ing perfect
could I have been bowling? could you have been bowling? could he have been bowling? could we have been bowling? could you have been bowling? could they have been bowling?
Interro-negative form
Simple form
could I not bowl? could you not bowl? could he not bowl? could we not bowl? could you not bowl? could they not bowl?
V-ing form
could I not be bowling? could you not be bowling? could he not be bowling? could we not be bowling? could you not be bowling? could they not be bowling?
Perfect
could I not have bowled? could you not have bowled? could he not have bowled? could we not have bowled? could you not have bowled? could they not have bowled?
V-ing perfect
could I not have been bowling? could you not have been bowling? could he not have been bowling? could we not have been bowling? could you not have been bowling? could they not have been bowling?