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 couldn't ally you couldn't ally he couldn't ally we couldn't ally you couldn't ally they couldn't ally
V-ing form
I couldn't be allying you couldn't be allying he couldn't be allying we couldn't be allying you couldn't be allying they couldn't be allying
Perfect
I couldn't have allied you couldn't have allied he couldn't have allied we couldn't have allied you couldn't have allied they couldn't have allied
V-ing perfect
I couldn't have been allying you couldn't have been allying he couldn't have been allying we couldn't have been allying you couldn't have been allying they couldn't 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
couldn't I ally? couldn't you ally? couldn't he ally? couldn't we ally? couldn't you ally? couldn't they ally?
V-ing form
couldn't I be allying? couldn't you be allying? couldn't he be allying? couldn't we be allying? couldn't you be allying? couldn't they be allying?
Perfect
couldn't I have allied? couldn't you have allied? couldn't he have allied? couldn't we have allied? couldn't you have allied? couldn't they have allied?
V-ing perfect
couldn't I have been allying? couldn't you have been allying? couldn't he have been allying? couldn't we have been allying? couldn't you have been allying? couldn't they have been allying?