i wonder引導什麼從句

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.

我納悶他怎麼從那牆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。