李娜被撞伤了。 Li Na was in an accident and she was injured. You know, when Chinese people say sb. was 撞伤, it often means there's a car crash or something like that. 送我到门外边。 Walk me to the door/gate. You can't tell if it refers to a door or a gate when Chinese people say 门. Sometimes, we use 大门 to refer to a gate. 被车撞。 be knocked by a car 撞车。 撞车can be used both as a phrase like "have a car crash" and as a noun "crash". And I think the former one is used more often.

http://tw.images.search.yahoo.com/search/images?p=%E6%92%9E%E8%BB%8A&fr=ush-globalnews&fr2=piv-web 以上的圖片 就是 撞車 撞車 就是 車輛互相衝撞 http://tupian.baike.com/a4_82_26_01200000231939117392609149582_jpg.html 以上的圖片 就是 撞車 撞車 就是 在木製的板車上，設有鐵葉包裹的撞木，是古代用來守城或攻城的器械。 舊唐書˙卷五十四˙竇建德傳：「建德縱撞車拋石，機巧絕妙，四面攻城，陷之。」

李娜 被撞伤了。 = Lina was hurt. 送 我 到 门 外边。 = Sent my outside the gates. 被 车 撞 = hurt by the car. 撞车 <- wrong phrase, cannot be used alone