I could motorboat you could motorboat he could motorboat we could motorboat you could motorboat they could motorboat
V-ing form
I could be motorboating you could be motorboating he could be motorboating we could be motorboating you could be motorboating they could be motorboating
Perfect
I could have motorboated you could have motorboated he could have motorboated we could have motorboated you could have motorboated they could have motorboated
V-ing perfect
I could have been motorboating you could have been motorboating he could have been motorboating we could have been motorboating you could have been motorboating they could have been motorboating
Negation
Simple form
I could not motorboat you could not motorboat he could not motorboat we could not motorboat you could not motorboat they could not motorboat
V-ing form
I could not be motorboating you could not be motorboating he could not be motorboating we could not be motorboating you could not be motorboating they could not be motorboating
Perfect
I could not have motorboated you could not have motorboated he could not have motorboated we could not have motorboated you could not have motorboated they could not have motorboated
V-ing perfect
I could not have been motorboating you could not have been motorboating he could not have been motorboating we could not have been motorboating you could not have been motorboating they could not have been motorboating
Interrogative form
Simple form
could I motorboat? could you motorboat? could he motorboat? could we motorboat? could you motorboat? could they motorboat?
V-ing form
could I be motorboating? could you be motorboating? could he be motorboating? could we be motorboating? could you be motorboating? could they be motorboating?
Perfect
could I have motorboated? could you have motorboated? could he have motorboated? could we have motorboated? could you have motorboated? could they have motorboated?
V-ing perfect
could I have been motorboating? could you have been motorboating? could he have been motorboating? could we have been motorboating? could you have been motorboating? could they have been motorboating?
Interro-negative form
Simple form
could I not motorboat? could you not motorboat? could he not motorboat? could we not motorboat? could you not motorboat? could they not motorboat?
V-ing form
could I not be motorboating? could you not be motorboating? could he not be motorboating? could we not be motorboating? could you not be motorboating? could they not be motorboating?
Perfect
could I not have motorboated? could you not have motorboated? could he not have motorboated? could we not have motorboated? could you not have motorboated? could they not have motorboated?
V-ing perfect
could I not have been motorboating? could you not have been motorboating? could he not have been motorboating? could we not have been motorboating? could you not have been motorboating? could they not have been motorboating?