I could bottom you could bottom he could bottom we could bottom you could bottom they could bottom
V-ing form
I could be bottoming you could be bottoming he could be bottoming we could be bottoming you could be bottoming they could be bottoming
Perfect
I could have bottomed you could have bottomed he could have bottomed we could have bottomed you could have bottomed they could have bottomed
V-ing perfect
I could have been bottoming you could have been bottoming he could have been bottoming we could have been bottoming you could have been bottoming they could have been bottoming
Negation
Simple form
I could not bottom you could not bottom he could not bottom we could not bottom you could not bottom they could not bottom
V-ing form
I could not be bottoming you could not be bottoming he could not be bottoming we could not be bottoming you could not be bottoming they could not be bottoming
Perfect
I could not have bottomed you could not have bottomed he could not have bottomed we could not have bottomed you could not have bottomed they could not have bottomed
V-ing perfect
I could not have been bottoming you could not have been bottoming he could not have been bottoming we could not have been bottoming you could not have been bottoming they could not have been bottoming
Interrogative form
Simple form
could I bottom? could you bottom? could he bottom? could we bottom? could you bottom? could they bottom?
V-ing form
could I be bottoming? could you be bottoming? could he be bottoming? could we be bottoming? could you be bottoming? could they be bottoming?
Perfect
could I have bottomed? could you have bottomed? could he have bottomed? could we have bottomed? could you have bottomed? could they have bottomed?
V-ing perfect
could I have been bottoming? could you have been bottoming? could he have been bottoming? could we have been bottoming? could you have been bottoming? could they have been bottoming?
Interro-negative form
Simple form
could I not bottom? could you not bottom? could he not bottom? could we not bottom? could you not bottom? could they not bottom?
V-ing form
could I not be bottoming? could you not be bottoming? could he not be bottoming? could we not be bottoming? could you not be bottoming? could they not be bottoming?
Perfect
could I not have bottomed? could you not have bottomed? could he not have bottomed? could we not have bottomed? could you not have bottomed? could they not have bottomed?
V-ing perfect
could I not have been bottoming? could you not have been bottoming? could he not have been bottoming? could we not have been bottoming? could you not have been bottoming? could they not have been bottoming?