I could expel you could expel he could expel we could expel you could expel they could expel
V-ing form
I could be expelling you could be expelling he could be expelling we could be expelling you could be expelling they could be expelling
Perfect
I could have expelled you could have expelled he could have expelled we could have expelled you could have expelled they could have expelled
V-ing perfect
I could have been expelling you could have been expelling he could have been expelling we could have been expelling you could have been expelling they could have been expelling
Negation
Simple form
I could not expel you could not expel he could not expel we could not expel you could not expel they could not expel
V-ing form
I could not be expelling you could not be expelling he could not be expelling we could not be expelling you could not be expelling they could not be expelling
Perfect
I could not have expelled you could not have expelled he could not have expelled we could not have expelled you could not have expelled they could not have expelled
V-ing perfect
I could not have been expelling you could not have been expelling he could not have been expelling we could not have been expelling you could not have been expelling they could not have been expelling
Interrogative form
Simple form
could I expel? could you expel? could he expel? could we expel? could you expel? could they expel?
V-ing form
could I be expelling? could you be expelling? could he be expelling? could we be expelling? could you be expelling? could they be expelling?
Perfect
could I have expelled? could you have expelled? could he have expelled? could we have expelled? could you have expelled? could they have expelled?
V-ing perfect
could I have been expelling? could you have been expelling? could he have been expelling? could we have been expelling? could you have been expelling? could they have been expelling?
Interro-negative form
Simple form
could I not expel? could you not expel? could he not expel? could we not expel? could you not expel? could they not expel?
V-ing form
could I not be expelling? could you not be expelling? could he not be expelling? could we not be expelling? could you not be expelling? could they not be expelling?
Perfect
could I not have expelled? could you not have expelled? could he not have expelled? could we not have expelled? could you not have expelled? could they not have expelled?
V-ing perfect
could I not have been expelling? could you not have been expelling? could he not have been expelling? could we not have been expelling? could you not have been expelling? could they not have been expelling?