i wonder引導什么從句

　　I wonder if you could point me in the right direction for the bus station.

　　請問您能指點我到公共汽車站往哪個方向走嗎？

　　I wonder if you can help me.

　　不知您是否能幫我的忙？

　　I wonder if I should wear a coat or not.

　　我不知道該不該穿外套。

　　I wonder he didn't hurt himself jumping over that wall.

　　我納悶他怎么從那墻上跳過去竟沒摔傷自己。

　　I wonder who that letter was from.

　　我不知道是誰來的信。