I could soap you could soap he could soap we could soap you could soap they could soap
V-ing form
I could be soaping you could be soaping he could be soaping we could be soaping you could be soaping they could be soaping
Perfect
I could have soaped you could have soaped he could have soaped we could have soaped you could have soaped they could have soaped
V-ing perfect
I could have been soaping you could have been soaping he could have been soaping we could have been soaping you could have been soaping they could have been soaping
Negation
Simple form
I could not soap you could not soap he could not soap we could not soap you could not soap they could not soap
V-ing form
I could not be soaping you could not be soaping he could not be soaping we could not be soaping you could not be soaping they could not be soaping
Perfect
I could not have soaped you could not have soaped he could not have soaped we could not have soaped you could not have soaped they could not have soaped
V-ing perfect
I could not have been soaping you could not have been soaping he could not have been soaping we could not have been soaping you could not have been soaping they could not have been soaping
Interrogative form
Simple form
could I soap? could you soap? could he soap? could we soap? could you soap? could they soap?
V-ing form
could I be soaping? could you be soaping? could he be soaping? could we be soaping? could you be soaping? could they be soaping?
Perfect
could I have soaped? could you have soaped? could he have soaped? could we have soaped? could you have soaped? could they have soaped?
V-ing perfect
could I have been soaping? could you have been soaping? could he have been soaping? could we have been soaping? could you have been soaping? could they have been soaping?
Interro-negative form
Simple form
could I not soap? could you not soap? could he not soap? could we not soap? could you not soap? could they not soap?
V-ing form
could I not be soaping? could you not be soaping? could he not be soaping? could we not be soaping? could you not be soaping? could they not be soaping?
Perfect
could I not have soaped? could you not have soaped? could he not have soaped? could we not have soaped? could you not have soaped? could they not have soaped?
V-ing perfect
could I not have been soaping? could you not have been soaping? could he not have been soaping? could we not have been soaping? could you not have been soaping? could they not have been soaping?