I could steamer you could steamer he could steamer we could steamer you could steamer they could steamer
V-ing form
I could be steamering you could be steamering he could be steamering we could be steamering you could be steamering they could be steamering
Perfect
I could have steamered you could have steamered he could have steamered we could have steamered you could have steamered they could have steamered
V-ing perfect
I could have been steamering you could have been steamering he could have been steamering we could have been steamering you could have been steamering they could have been steamering
Negation
Simple form
I could not steamer you could not steamer he could not steamer we could not steamer you could not steamer they could not steamer
V-ing form
I could not be steamering you could not be steamering he could not be steamering we could not be steamering you could not be steamering they could not be steamering
Perfect
I could not have steamered you could not have steamered he could not have steamered we could not have steamered you could not have steamered they could not have steamered
V-ing perfect
I could not have been steamering you could not have been steamering he could not have been steamering we could not have been steamering you could not have been steamering they could not have been steamering
Interrogative form
Simple form
could I steamer? could you steamer? could he steamer? could we steamer? could you steamer? could they steamer?
V-ing form
could I be steamering? could you be steamering? could he be steamering? could we be steamering? could you be steamering? could they be steamering?
Perfect
could I have steamered? could you have steamered? could he have steamered? could we have steamered? could you have steamered? could they have steamered?
V-ing perfect
could I have been steamering? could you have been steamering? could he have been steamering? could we have been steamering? could you have been steamering? could they have been steamering?
Interro-negative form
Simple form
could I not steamer? could you not steamer? could he not steamer? could we not steamer? could you not steamer? could they not steamer?
V-ing form
could I not be steamering? could you not be steamering? could he not be steamering? could we not be steamering? could you not be steamering? could they not be steamering?
Perfect
could I not have steamered? could you not have steamered? could he not have steamered? could we not have steamered? could you not have steamered? could they not have steamered?
V-ing perfect
could I not have been steamering? could you not have been steamering? could he not have been steamering? could we not have been steamering? could you not have been steamering? could they not have been steamering?