I could housekeep you could housekeep he could housekeep we could housekeep you could housekeep they could housekeep
V-ing form
I could be housekeeping you could be housekeeping he could be housekeeping we could be housekeeping you could be housekeeping they could be housekeeping
Perfect
I could have housekept you could have housekept he could have housekept we could have housekept you could have housekept they could have housekept
V-ing perfect
I could have been housekeeping you could have been housekeeping he could have been housekeeping we could have been housekeeping you could have been housekeeping they could have been housekeeping
Negation
Simple form
I could not housekeep you could not housekeep he could not housekeep we could not housekeep you could not housekeep they could not housekeep
V-ing form
I could not be housekeeping you could not be housekeeping he could not be housekeeping we could not be housekeeping you could not be housekeeping they could not be housekeeping
Perfect
I could not have housekept you could not have housekept he could not have housekept we could not have housekept you could not have housekept they could not have housekept
V-ing perfect
I could not have been housekeeping you could not have been housekeeping he could not have been housekeeping we could not have been housekeeping you could not have been housekeeping they could not have been housekeeping
Interrogative form
Simple form
could I housekeep? could you housekeep? could he housekeep? could we housekeep? could you housekeep? could they housekeep?
V-ing form
could I be housekeeping? could you be housekeeping? could he be housekeeping? could we be housekeeping? could you be housekeeping? could they be housekeeping?
Perfect
could I have housekept? could you have housekept? could he have housekept? could we have housekept? could you have housekept? could they have housekept?
V-ing perfect
could I have been housekeeping? could you have been housekeeping? could he have been housekeeping? could we have been housekeeping? could you have been housekeeping? could they have been housekeeping?
Interro-negative form
Simple form
could I not housekeep? could you not housekeep? could he not housekeep? could we not housekeep? could you not housekeep? could they not housekeep?
V-ing form
could I not be housekeeping? could you not be housekeeping? could he not be housekeeping? could we not be housekeeping? could you not be housekeeping? could they not be housekeeping?
Perfect
could I not have housekept? could you not have housekept? could he not have housekept? could we not have housekept? could you not have housekept? could they not have housekept?
V-ing perfect
could I not have been housekeeping? could you not have been housekeeping? could he not have been housekeeping? could we not have been housekeeping? could you not have been housekeeping? could they not have been housekeeping?