I could match you could match he could match we could match you could match they could match
V-ing form
I could be matching you could be matching he could be matching we could be matching you could be matching they could be matching
Perfect
I could have matched you could have matched he could have matched we could have matched you could have matched they could have matched
V-ing perfect
I could have been matching you could have been matching he could have been matching we could have been matching you could have been matching they could have been matching
Negation
Simple form
I could not match you could not match he could not match we could not match you could not match they could not match
V-ing form
I could not be matching you could not be matching he could not be matching we could not be matching you could not be matching they could not be matching
Perfect
I could not have matched you could not have matched he could not have matched we could not have matched you could not have matched they could not have matched
V-ing perfect
I could not have been matching you could not have been matching he could not have been matching we could not have been matching you could not have been matching they could not have been matching
Interrogative form
Simple form
could I match? could you match? could he match? could we match? could you match? could they match?
V-ing form
could I be matching? could you be matching? could he be matching? could we be matching? could you be matching? could they be matching?
Perfect
could I have matched? could you have matched? could he have matched? could we have matched? could you have matched? could they have matched?
V-ing perfect
could I have been matching? could you have been matching? could he have been matching? could we have been matching? could you have been matching? could they have been matching?
Interro-negative form
Simple form
could I not match? could you not match? could he not match? could we not match? could you not match? could they not match?
V-ing form
could I not be matching? could you not be matching? could he not be matching? could we not be matching? could you not be matching? could they not be matching?
Perfect
could I not have matched? could you not have matched? could he not have matched? could we not have matched? could you not have matched? could they not have matched?
V-ing perfect
could I not have been matching? could you not have been matching? could he not have been matching? could we not have been matching? could you not have been matching? could they not have been matching?