这"谓语动词和非谓语动词"今天已是第十帖了，我也快成是贵州驴了，就此打住。分词和不定式的用法还真是个语法难点，我们只能多用多练，在错误中学习错误改正错误。尤其是那个dangling structure, 稍不留神老中老外但凡都爱这个错。下面是一组关于dangling structure的改错题，望大家能给出正确答案，并在以后的写作中少犯这个错。

Now here is the chance for you to practice what you’ve learned in the last two sections.  The following are the sentences with dangling problems.  Rewrite them with correct sentences:

1.         Having been thrown in the air, the dog caught the stick.

2.         Smashed flat by a passing truck, Big Dog sniffed at what was left of a half-eaten hamburger.

3.         Changing the oil every 3,000 miles, the car seemed to run better.

4.         Raised in a small beach town, it is natural to miss the smell of the sea.

5.         Although nearly finished, we left the play early because we were worried about our sick cat.

6.         When taking a grammar quiz, concentration is everything.

7.         On completing the grammar quiz, leaving the classroom is acceptable.