I could propose you could propose he could propose we could propose you could propose they could propose
V-ing form
I could be proposing you could be proposing he could be proposing we could be proposing you could be proposing they could be proposing
Perfect
I could have proposed you could have proposed he could have proposed we could have proposed you could have proposed they could have proposed
V-ing perfect
I could have been proposing you could have been proposing he could have been proposing we could have been proposing you could have been proposing they could have been proposing
Negation
Simple form
I could not propose you could not propose he could not propose we could not propose you could not propose they could not propose
V-ing form
I could not be proposing you could not be proposing he could not be proposing we could not be proposing you could not be proposing they could not be proposing
Perfect
I could not have proposed you could not have proposed he could not have proposed we could not have proposed you could not have proposed they could not have proposed
V-ing perfect
I could not have been proposing you could not have been proposing he could not have been proposing we could not have been proposing you could not have been proposing they could not have been proposing
Interrogative form
Simple form
could I propose? could you propose? could he propose? could we propose? could you propose? could they propose?
V-ing form
could I be proposing? could you be proposing? could he be proposing? could we be proposing? could you be proposing? could they be proposing?
Perfect
could I have proposed? could you have proposed? could he have proposed? could we have proposed? could you have proposed? could they have proposed?
V-ing perfect
could I have been proposing? could you have been proposing? could he have been proposing? could we have been proposing? could you have been proposing? could they have been proposing?
Interro-negative form
Simple form
could I not propose? could you not propose? could he not propose? could we not propose? could you not propose? could they not propose?
V-ing form
could I not be proposing? could you not be proposing? could he not be proposing? could we not be proposing? could you not be proposing? could they not be proposing?
Perfect
could I not have proposed? could you not have proposed? could he not have proposed? could we not have proposed? could you not have proposed? could they not have proposed?
V-ing perfect
could I not have been proposing? could you not have been proposing? could he not have been proposing? could we not have been proposing? could you not have been proposing? could they not have been proposing?