I could chant you could chant she could chant we could chant you could chant they could chant
V-ing form
I could be chanting you could be chanting she could be chanting we could be chanting you could be chanting they could be chanting
Perfect
I could have chanted you could have chanted she 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 she could have been chanting we could have been chanting you could have been chanting they could have been chanting
Negation
Simple form
I couldn't chant you couldn't chant she couldn't chant we couldn't chant you couldn't chant they couldn't chant
V-ing form
I couldn't be chanting you couldn't be chanting she couldn't be chanting we couldn't be chanting you couldn't be chanting they couldn't be chanting
Perfect
I couldn't have chanted you couldn't have chanted she couldn't have chanted we couldn't have chanted you couldn't have chanted they couldn't have chanted
V-ing perfect
I couldn't have been chanting you couldn't have been chanting she couldn't have been chanting we couldn't have been chanting you couldn't have been chanting they couldn't have been chanting
Interrogative form
Simple form
could I chant? could you chant? could she chant? could we chant? could you chant? could they chant?
V-ing form
could I be chanting? could you be chanting? could she be chanting? could we be chanting? could you be chanting? could they be chanting?
Perfect
could I have chanted? could you have chanted? could she 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 she have been chanting? could we have been chanting? could you have been chanting? could they have been chanting?
Interro-negative form
Simple form
couldn't I chant? couldn't you chant? couldn't she chant? couldn't we chant? couldn't you chant? couldn't they chant?
V-ing form
couldn't I be chanting? couldn't you be chanting? couldn't she be chanting? couldn't we be chanting? couldn't you be chanting? couldn't they be chanting?
Perfect
couldn't I have chanted? couldn't you have chanted? couldn't she have chanted? couldn't we have chanted? couldn't you have chanted? couldn't they have chanted?
V-ing perfect
couldn't I have been chanting? couldn't you have been chanting? couldn't she have been chanting? couldn't we have been chanting? couldn't you have been chanting? couldn't they have been chanting?