I could broaden you could broaden he could broaden we could broaden you could broaden they could broaden
V-ing form
I could be broadening you could be broadening he could be broadening we could be broadening you could be broadening they could be broadening
Perfect
I could have broadened you could have broadened he could have broadened we could have broadened you could have broadened they could have broadened
V-ing perfect
I could have been broadening you could have been broadening he could have been broadening we could have been broadening you could have been broadening they could have been broadening
Negation
Simple form
I could not broaden you could not broaden he could not broaden we could not broaden you could not broaden they could not broaden
V-ing form
I could not be broadening you could not be broadening he could not be broadening we could not be broadening you could not be broadening they could not be broadening
Perfect
I could not have broadened you could not have broadened he could not have broadened we could not have broadened you could not have broadened they could not have broadened
V-ing perfect
I could not have been broadening you could not have been broadening he could not have been broadening we could not have been broadening you could not have been broadening they could not have been broadening
Interrogative form
Simple form
could I broaden? could you broaden? could he broaden? could we broaden? could you broaden? could they broaden?
V-ing form
could I be broadening? could you be broadening? could he be broadening? could we be broadening? could you be broadening? could they be broadening?
Perfect
could I have broadened? could you have broadened? could he have broadened? could we have broadened? could you have broadened? could they have broadened?
V-ing perfect
could I have been broadening? could you have been broadening? could he have been broadening? could we have been broadening? could you have been broadening? could they have been broadening?
Interro-negative form
Simple form
could I not broaden? could you not broaden? could he not broaden? could we not broaden? could you not broaden? could they not broaden?
V-ing form
could I not be broadening? could you not be broadening? could he not be broadening? could we not be broadening? could you not be broadening? could they not be broadening?
Perfect
could I not have broadened? could you not have broadened? could he not have broadened? could we not have broadened? could you not have broadened? could they not have broadened?
V-ing perfect
could I not have been broadening? could you not have been broadening? could he not have been broadening? could we not have been broadening? could you not have been broadening? could they not have been broadening?