I could repel you could repel he could repel we could repel you could repel they could repel
V-ing form
I could be repelling you could be repelling he could be repelling we could be repelling you could be repelling they could be repelling
Perfect
I could have repelled you could have repelled he could have repelled we could have repelled you could have repelled they could have repelled
V-ing perfect
I could have been repelling you could have been repelling he could have been repelling we could have been repelling you could have been repelling they could have been repelling
Negation
Simple form
I couldn't repel you couldn't repel he couldn't repel we couldn't repel you couldn't repel they couldn't repel
V-ing form
I couldn't be repelling you couldn't be repelling he couldn't be repelling we couldn't be repelling you couldn't be repelling they couldn't be repelling
Perfect
I couldn't have repelled you couldn't have repelled he couldn't have repelled we couldn't have repelled you couldn't have repelled they couldn't have repelled
V-ing perfect
I couldn't have been repelling you couldn't have been repelling he couldn't have been repelling we couldn't have been repelling you couldn't have been repelling they couldn't have been repelling
Interrogative form
Simple form
could I repel? could you repel? could he repel? could we repel? could you repel? could they repel?
V-ing form
could I be repelling? could you be repelling? could he be repelling? could we be repelling? could you be repelling? could they be repelling?
Perfect
could I have repelled? could you have repelled? could he have repelled? could we have repelled? could you have repelled? could they have repelled?
V-ing perfect
could I have been repelling? could you have been repelling? could he have been repelling? could we have been repelling? could you have been repelling? could they have been repelling?
Interro-negative form
Simple form
couldn't I repel? couldn't you repel? couldn't he repel? couldn't we repel? couldn't you repel? couldn't they repel?
V-ing form
couldn't I be repelling? couldn't you be repelling? couldn't he be repelling? couldn't we be repelling? couldn't you be repelling? couldn't they be repelling?
Perfect
couldn't I have repelled? couldn't you have repelled? couldn't he have repelled? couldn't we have repelled? couldn't you have repelled? couldn't they have repelled?
V-ing perfect
couldn't I have been repelling? couldn't you have been repelling? couldn't he have been repelling? couldn't we have been repelling? couldn't you have been repelling? couldn't they have been repelling?