I could overflow you could overflow he could overflow we could overflow you could overflow they could overflow
V-ing form
I could be overflowing you could be overflowing he could be overflowing we could be overflowing you could be overflowing they could be overflowing
Perfect
I could have overflowed you could have overflowed he could have overflowed we could have overflowed you could have overflowed they could have overflowed
V-ing perfect
I could have been overflowing you could have been overflowing he could have been overflowing we could have been overflowing you could have been overflowing they could have been overflowing
Negation
Simple form
I could not overflow you could not overflow he could not overflow we could not overflow you could not overflow they could not overflow
V-ing form
I could not be overflowing you could not be overflowing he could not be overflowing we could not be overflowing you could not be overflowing they could not be overflowing
Perfect
I could not have overflowed you could not have overflowed he could not have overflowed we could not have overflowed you could not have overflowed they could not have overflowed
V-ing perfect
I could not have been overflowing you could not have been overflowing he could not have been overflowing we could not have been overflowing you could not have been overflowing they could not have been overflowing
Interrogative form
Simple form
could I overflow? could you overflow? could he overflow? could we overflow? could you overflow? could they overflow?
V-ing form
could I be overflowing? could you be overflowing? could he be overflowing? could we be overflowing? could you be overflowing? could they be overflowing?
Perfect
could I have overflowed? could you have overflowed? could he have overflowed? could we have overflowed? could you have overflowed? could they have overflowed?
V-ing perfect
could I have been overflowing? could you have been overflowing? could he have been overflowing? could we have been overflowing? could you have been overflowing? could they have been overflowing?
Interro-negative form
Simple form
could I not overflow? could you not overflow? could he not overflow? could we not overflow? could you not overflow? could they not overflow?
V-ing form
could I not be overflowing? could you not be overflowing? could he not be overflowing? could we not be overflowing? could you not be overflowing? could they not be overflowing?
Perfect
could I not have overflowed? could you not have overflowed? could he not have overflowed? could we not have overflowed? could you not have overflowed? could they not have overflowed?
V-ing perfect
could I not have been overflowing? could you not have been overflowing? could he not have been overflowing? could we not have been overflowing? could you not have been overflowing? could they not have been overflowing?