WWCD?

What Would Chinese Do?

In developing Gwr vocab, it strikes me as useful to know a bit more about
Chinese than I do.

How if at all does Chin. differentiate trans./intrans./stative forms of a
verb? e.g. John opened the door; the door is open; the door opened

Is there a passive voice? (the door was opened by John) Regardless, I want
Gwr to have one.....

Is there any kind of derivational morphology (new or historical?)

Anything else that might be useful to know???? (silly question...)

Thanks. R.