I could invest you could invest he could invest we could invest you could invest they could invest
V-ing form
I could be investing you could be investing he could be investing we could be investing you could be investing they could be investing
Perfect
I could have invested you could have invested he could have invested we could have invested you could have invested they could have invested
V-ing perfect
I could have been investing you could have been investing he could have been investing we could have been investing you could have been investing they could have been investing
Negation
Simple form
I could not invest you could not invest he could not invest we could not invest you could not invest they could not invest
V-ing form
I could not be investing you could not be investing he could not be investing we could not be investing you could not be investing they could not be investing
Perfect
I could not have invested you could not have invested he could not have invested we could not have invested you could not have invested they could not have invested
V-ing perfect
I could not have been investing you could not have been investing he could not have been investing we could not have been investing you could not have been investing they could not have been investing
Interrogative form
Simple form
could I invest? could you invest? could he invest? could we invest? could you invest? could they invest?
V-ing form
could I be investing? could you be investing? could he be investing? could we be investing? could you be investing? could they be investing?
Perfect
could I have invested? could you have invested? could he have invested? could we have invested? could you have invested? could they have invested?
V-ing perfect
could I have been investing? could you have been investing? could he have been investing? could we have been investing? could you have been investing? could they have been investing?
Interro-negative form
Simple form
could I not invest? could you not invest? could he not invest? could we not invest? could you not invest? could they not invest?
V-ing form
could I not be investing? could you not be investing? could he not be investing? could we not be investing? could you not be investing? could they not be investing?
Perfect
could I not have invested? could you not have invested? could he not have invested? could we not have invested? could you not have invested? could they not have invested?
V-ing perfect
could I not have been investing? could you not have been investing? could he not have been investing? could we not have been investing? could you not have been investing? could they not have been investing?