（4）状语：（以下例句值得一背！）
① If you turn to the left, you'll find the station.
→ Turning to the left, you'll find the station.
② As I didn't receive her letter, I called her up by telephone.
→ Not receiving her letter, I called her up by telephone.
③ While I was walking to school yesterday morning, I met a friend.
→ Walking to school yesterday morning, I met a friend.
④ When she was asked it she had any bad habit, she answeredthat she was a heavy smoker.
→ Asked if she had any bad habit, she answered that she was a heavy smoker.
你知道吗？注意：在运用此类句型时主语前后要保持一致。
① Whenschool was over, the boys went home.
→ Being over, the boys went home. ×
School being over, the boys went home. √
② As my homework has been done, I have nothing else to do.
→ My homework having been done, I have nothing else to do.
③ Ifweather permits, I'll start tomorrow.
→ Weather permitting, I'll start tomorrow.
④ I fwe judge from his face, he must be ill.
→ Judging from his face, he must be ill.（这里应该是we judging ...，但若主语是we, one, you表示“一般人”，主语可省略）
实际上，这里涉及到独立主格结构问题，以后在作分解！
4.分词的时态：
现在分词一般时表示此动作与主句谓语动词同时发生。
现在分词完成时表示此动作在主句谓语动词之前发生。
Entering the room, hesaw he. （几乎同时）
Not having tried his best, he failed in the exam. （分词动作在前）
5.语态：现在分词一般时被动表动作正在被进行，完成时被动强调分词所表示的动作先被完成。
The ships being loaded and unloaded belong to us.
Having been warned of typhoon, the fishermen sailed for the nearest harbor.（渔民先被告知而后驶向港口）
