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 couldn't houseclean you couldn't houseclean he couldn't houseclean we couldn't houseclean you couldn't houseclean they couldn't houseclean
V-ing form
I couldn't be housecleaning you couldn't be housecleaning he couldn't be housecleaning we couldn't be housecleaning you couldn't be housecleaning they couldn't be housecleaning
Perfect
I couldn't have housecleaned you couldn't have housecleaned he couldn't have housecleaned we couldn't have housecleaned you couldn't have housecleaned they couldn't have housecleaned
V-ing perfect
I couldn't have been housecleaning you couldn't have been housecleaning he couldn't have been housecleaning we couldn't have been housecleaning you couldn't have been housecleaning they couldn't 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
couldn't I houseclean? couldn't you houseclean? couldn't he houseclean? couldn't we houseclean? couldn't you houseclean? couldn't they houseclean?
V-ing form
couldn't I be housecleaning? couldn't you be housecleaning? couldn't he be housecleaning? couldn't we be housecleaning? couldn't you be housecleaning? couldn't they be housecleaning?
Perfect
couldn't I have housecleaned? couldn't you have housecleaned? couldn't he have housecleaned? couldn't we have housecleaned? couldn't you have housecleaned? couldn't they have housecleaned?
V-ing perfect
couldn't I have been housecleaning? couldn't you have been housecleaning? couldn't he have been housecleaning? couldn't we have been housecleaning? couldn't you have been housecleaning? couldn't they have been housecleaning?