I could slit you could slit she could slit we could slit you could slit they could slit
V-ing form
I could be slitting you could be slitting she could be slitting we could be slitting you could be slitting they could be slitting
Perfect
I could have slit you could have slit she could have slit we could have slit you could have slit they could have slit
V-ing perfect
I could have been slitting you could have been slitting she could have been slitting we could have been slitting you could have been slitting they could have been slitting
Negation
Simple form
I could not slit you could not slit she could not slit we could not slit you could not slit they could not slit
V-ing form
I could not be slitting you could not be slitting she could not be slitting we could not be slitting you could not be slitting they could not be slitting
Perfect
I could not have slit you could not have slit she could not have slit we could not have slit you could not have slit they could not have slit
V-ing perfect
I could not have been slitting you could not have been slitting she could not have been slitting we could not have been slitting you could not have been slitting they could not have been slitting
Interrogative form
Simple form
could I slit? could you slit? could she slit? could we slit? could you slit? could they slit?
V-ing form
could I be slitting? could you be slitting? could she be slitting? could we be slitting? could you be slitting? could they be slitting?
Perfect
could I have slit? could you have slit? could she have slit? could we have slit? could you have slit? could they have slit?
V-ing perfect
could I have been slitting? could you have been slitting? could she have been slitting? could we have been slitting? could you have been slitting? could they have been slitting?
Interro-negative form
Simple form
could I not slit? could you not slit? could she not slit? could we not slit? could you not slit? could they not slit?
V-ing form
could I not be slitting? could you not be slitting? could she not be slitting? could we not be slitting? could you not be slitting? could they not be slitting?
Perfect
could I not have slit? could you not have slit? could she not have slit? could we not have slit? could you not have slit? could they not have slit?
V-ing perfect
could I not have been slitting? could you not have been slitting? could she not have been slitting? could we not have been slitting? could you not have been slitting? could they not have been slitting?