I could really you could really he could really we could really you could really they could really
V-ing form
I could be reallying you could be reallying he could be reallying we could be reallying you could be reallying they could be reallying
Perfect
I could have reallied you could have reallied he could have reallied we could have reallied you could have reallied they could have reallied
V-ing perfect
I could have been reallying you could have been reallying he could have been reallying we could have been reallying you could have been reallying they could have been reallying
Negation
Simple form
I could not really you could not really he could not really we could not really you could not really they could not really
V-ing form
I could not be reallying you could not be reallying he could not be reallying we could not be reallying you could not be reallying they could not be reallying
Perfect
I could not have reallied you could not have reallied he could not have reallied we could not have reallied you could not have reallied they could not have reallied
V-ing perfect
I could not have been reallying you could not have been reallying he could not have been reallying we could not have been reallying you could not have been reallying they could not have been reallying
Interrogative form
Simple form
could I really? could you really? could he really? could we really? could you really? could they really?
V-ing form
could I be reallying? could you be reallying? could he be reallying? could we be reallying? could you be reallying? could they be reallying?
Perfect
could I have reallied? could you have reallied? could he have reallied? could we have reallied? could you have reallied? could they have reallied?
V-ing perfect
could I have been reallying? could you have been reallying? could he have been reallying? could we have been reallying? could you have been reallying? could they have been reallying?
Interro-negative form
Simple form
could I not really? could you not really? could he not really? could we not really? could you not really? could they not really?
V-ing form
could I not be reallying? could you not be reallying? could he not be reallying? could we not be reallying? could you not be reallying? could they not be reallying?
Perfect
could I not have reallied? could you not have reallied? could he not have reallied? could we not have reallied? could you not have reallied? could they not have reallied?
V-ing perfect
could I not have been reallying? could you not have been reallying? could he not have been reallying? could we not have been reallying? could you not have been reallying? could they not have been reallying?