I could chant you could chant he could chant we could chant you could chant they could chant
V-ing form
I could be chanting you could be chanting he could be chanting we could be chanting you could be chanting they could be chanting
Perfect
I could have chanted you could have chanted he could have chanted we could have chanted you could have chanted they could have chanted
V-ing perfect
I could have been chanting you could have been chanting he could have been chanting we could have been chanting you could have been chanting they could have been chanting
Negation
Simple form
I could not chant you could not chant he could not chant we could not chant you could not chant they could not chant
V-ing form
I could not be chanting you could not be chanting he could not be chanting we could not be chanting you could not be chanting they could not be chanting
Perfect
I could not have chanted you could not have chanted he could not have chanted we could not have chanted you could not have chanted they could not have chanted
V-ing perfect
I could not have been chanting you could not have been chanting he could not have been chanting we could not have been chanting you could not have been chanting they could not have been chanting
Interrogative form
Simple form
could I chant? could you chant? could he chant? could we chant? could you chant? could they chant?
V-ing form
could I be chanting? could you be chanting? could he be chanting? could we be chanting? could you be chanting? could they be chanting?
Perfect
could I have chanted? could you have chanted? could he have chanted? could we have chanted? could you have chanted? could they have chanted?
V-ing perfect
could I have been chanting? could you have been chanting? could he have been chanting? could we have been chanting? could you have been chanting? could they have been chanting?
Interro-negative form
Simple form
could I not chant? could you not chant? could he not chant? could we not chant? could you not chant? could they not chant?
V-ing form
could I not be chanting? could you not be chanting? could he not be chanting? could we not be chanting? could you not be chanting? could they not be chanting?
Perfect
could I not have chanted? could you not have chanted? could he not have chanted? could we not have chanted? could you not have chanted? could they not have chanted?
V-ing perfect
could I not have been chanting? could you not have been chanting? could he not have been chanting? could we not have been chanting? could you not have been chanting? could they not have been chanting?