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 couldn't gurgle you couldn't gurgle she couldn't gurgle we couldn't gurgle you couldn't gurgle they couldn't gurgle
V-ing form
I couldn't be gurgling you couldn't be gurgling she couldn't be gurgling we couldn't be gurgling you couldn't be gurgling they couldn't be gurgling
Perfect
I couldn't have gurgled you couldn't have gurgled she couldn't have gurgled we couldn't have gurgled you couldn't have gurgled they couldn't have gurgled
V-ing perfect
I couldn't have been gurgling you couldn't have been gurgling she couldn't have been gurgling we couldn't have been gurgling you couldn't have been gurgling they couldn't 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
couldn't I gurgle? couldn't you gurgle? couldn't she gurgle? couldn't we gurgle? couldn't you gurgle? couldn't they gurgle?
V-ing form
couldn't I be gurgling? couldn't you be gurgling? couldn't she be gurgling? couldn't we be gurgling? couldn't you be gurgling? couldn't they be gurgling?
Perfect
couldn't I have gurgled? couldn't you have gurgled? couldn't she have gurgled? couldn't we have gurgled? couldn't you have gurgled? couldn't they have gurgled?
V-ing perfect
couldn't I have been gurgling? couldn't you have been gurgling? couldn't she have been gurgling? couldn't we have been gurgling? couldn't you have been gurgling? couldn't they have been gurgling?