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