I could ally you could ally he could ally we could ally you could ally they could ally
V-ing form
I could be allying you could be allying he could be allying we could be allying you could be allying they could be allying
Perfect
I could have allied you could have allied he could have allied we could have allied you could have allied they could have allied
V-ing perfect
I could have been allying you could have been allying he could have been allying we could have been allying you could have been allying they could have been allying
Negation
Simple form
I could not ally you could not ally he could not ally we could not ally you could not ally they could not ally
V-ing form
I could not be allying you could not be allying he could not be allying we could not be allying you could not be allying they could not be allying
Perfect
I could not have allied you could not have allied he could not have allied we could not have allied you could not have allied they could not have allied
V-ing perfect
I could not have been allying you could not have been allying he could not have been allying we could not have been allying you could not have been allying they could not have been allying
Interrogative form
Simple form
could I ally? could you ally? could he ally? could we ally? could you ally? could they ally?
V-ing form
could I be allying? could you be allying? could he be allying? could we be allying? could you be allying? could they be allying?
Perfect
could I have allied? could you have allied? could he have allied? could we have allied? could you have allied? could they have allied?
V-ing perfect
could I have been allying? could you have been allying? could he have been allying? could we have been allying? could you have been allying? could they have been allying?
Interro-negative form
Simple form
could I not ally? could you not ally? could he not ally? could we not ally? could you not ally? could they not ally?
V-ing form
could I not be allying? could you not be allying? could he not be allying? could we not be allying? could you not be allying? could they not be allying?
Perfect
could I not have allied? could you not have allied? could he not have allied? could we not have allied? could you not have allied? could they not have allied?
V-ing perfect
could I not have been allying? could you not have been allying? could he not have been allying? could we not have been allying? could you not have been allying? could they not have been allying?