I could gurgle you could gurgle she could gurgle we could gurgle you could gurgle they could gurgle
V-ing form
I could be gurgling you could be gurgling she could be gurgling we could be gurgling you could be gurgling they could be gurgling
Perfect
I could have gurgled you could have gurgled she could have gurgled we could have gurgled you could have gurgled they could have gurgled
V-ing perfect
I could have been gurgling you could have been gurgling she could have been gurgling we could have been gurgling you could have been gurgling they could have been gurgling
Negation
Simple form
I could not gurgle you could not gurgle she could not gurgle we could not gurgle you could not gurgle they could not gurgle
V-ing form
I could not be gurgling you could not be gurgling she could not be gurgling we could not be gurgling you could not be gurgling they could not be gurgling
Perfect
I could not have gurgled you could not have gurgled she could not have gurgled we could not have gurgled you could not have gurgled they could not have gurgled
V-ing perfect
I could not have been gurgling you could not have been gurgling she could not have been gurgling we could not have been gurgling you could not have been gurgling they could not have been gurgling
Interrogative form
Simple form
could I gurgle? could you gurgle? could she gurgle? could we gurgle? could you gurgle? could they gurgle?
V-ing form
could I be gurgling? could you be gurgling? could she be gurgling? could we be gurgling? could you be gurgling? could they be gurgling?
Perfect
could I have gurgled? could you have gurgled? could she have gurgled? could we have gurgled? could you have gurgled? could they have gurgled?
V-ing perfect
could I have been gurgling? could you have been gurgling? could she have been gurgling? could we have been gurgling? could you have been gurgling? could they have been gurgling?
Interro-negative form
Simple form
could I not gurgle? could you not gurgle? could she not gurgle? could we not gurgle? could you not gurgle? could they not gurgle?
V-ing form
could I not be gurgling? could you not be gurgling? could she not be gurgling? could we not be gurgling? could you not be gurgling? could they not be gurgling?
Perfect
could I not have gurgled? could you not have gurgled? could she not have gurgled? could we not have gurgled? could you not have gurgled? could they not have gurgled?
V-ing perfect
could I not have been gurgling? could you not have been gurgling? could she not have been gurgling? could we not have been gurgling? could you not have been gurgling? could they not have been gurgling?