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