I could houseclean you could houseclean he could houseclean we could houseclean you could houseclean they could houseclean
V-ing form
I could be housecleaning you could be housecleaning he could be housecleaning we could be housecleaning you could be housecleaning they could be housecleaning
Perfect
I could have housecleaned you could have housecleaned he could have housecleaned we could have housecleaned you could have housecleaned they could have housecleaned
V-ing perfect
I could have been housecleaning you could have been housecleaning he could have been housecleaning we could have been housecleaning you could have been housecleaning they could have been housecleaning
Negation
Simple form
I could not houseclean you could not houseclean he could not houseclean we could not houseclean you could not houseclean they could not houseclean
V-ing form
I could not be housecleaning you could not be housecleaning he could not be housecleaning we could not be housecleaning you could not be housecleaning they could not be housecleaning
Perfect
I could not have housecleaned you could not have housecleaned he could not have housecleaned we could not have housecleaned you could not have housecleaned they could not have housecleaned
V-ing perfect
I could not have been housecleaning you could not have been housecleaning he could not have been housecleaning we could not have been housecleaning you could not have been housecleaning they could not have been housecleaning
Interrogative form
Simple form
could I houseclean? could you houseclean? could he houseclean? could we houseclean? could you houseclean? could they houseclean?
V-ing form
could I be housecleaning? could you be housecleaning? could he be housecleaning? could we be housecleaning? could you be housecleaning? could they be housecleaning?
Perfect
could I have housecleaned? could you have housecleaned? could he have housecleaned? could we have housecleaned? could you have housecleaned? could they have housecleaned?
V-ing perfect
could I have been housecleaning? could you have been housecleaning? could he have been housecleaning? could we have been housecleaning? could you have been housecleaning? could they have been housecleaning?
Interro-negative form
Simple form
could I not houseclean? could you not houseclean? could he not houseclean? could we not houseclean? could you not houseclean? could they not houseclean?
V-ing form
could I not be housecleaning? could you not be housecleaning? could he not be housecleaning? could we not be housecleaning? could you not be housecleaning? could they not be housecleaning?
Perfect
could I not have housecleaned? could you not have housecleaned? could he not have housecleaned? could we not have housecleaned? could you not have housecleaned? could they not have housecleaned?
V-ing perfect
could I not have been housecleaning? could you not have been housecleaning? could he not have been housecleaning? could we not have been housecleaning? could you not have been housecleaning? could they not have been housecleaning?