1. 表示时间、让步或条件的状语从句往往可以改写为介词词组作状语。
1) They looked both ways before they crossed the street.
2) I made my decision after I talked to Sir Francis.
3) Although he was ill, he was determined to carry out his plan.
4) Although they’re intelligent, they aren’t doing well in school.
5) Although he’s rich, he isn’t very happy.
6) Although he’s tall, he isn’t a very good basketball player.
7) If we had your support, we might succeed in performing our task.
8) Even if there were air and water, plants still couldn’t grow on the moon.
9) If you don’t work hard, you will accomplish nothing.
10) If it had not been for their assistance, he would have found himself in trouble.

2. 起伴随或补充说明作用的从句、简单句或并列谓语往往可以改写为“with +名词+分词/形容词/介词词组”的结构作状语。
1) They wear layers of clothes even in summer time. Newspapers are stuffed between the layers as further protection against bad weather.
2) If more people help them, they probably will be able to accomplish the task ahead of time.
3) As all his savings were gone, he started to look for a job.
4) In the corner there is a table. One of its legs is shorter than the others.
5) When the job was finished, we went to the seaside for a holiday.
6) As the pace of change is quickening, more and more scientists find it hard to keep up with the latest developments even in their own disciplines.
7) She looked in my face and tears streamed down her cheeks.

3. 还有另外一些从句或简单句也可以改写为介词词组作状语。
1) She won’t go home until she has taken the exam.
2) Because he had a bad leg, he couldn’t walk as fast as the others.
3) We are full aware that the situation is serious.
4) She hurried back to school for fear that she miss too many lessons.
5) We should not criticize Susan for what she has done. Instead, we ought to praise her for it.
6) Helen did not go straight home after school. She went to work as a waitress in a restaurant.
7) I am not going to send the book to Allan by post. I am going to take it to him myself.
8) Dr. Wilson did not go to New York yesterday to attend his daughter’s wedding. He flew to Florida for an emergency case.

4. 系表结构的定语从句往往可以改写为直接用形容词、介词词组或分词结构作定语。
1) I love girls who are intelligent
2) At the party, I got to know a professor who is in his thirties.
3) I hate to see letters that are written in pencil.
4) The substance, which was discovered almost by accident, has revolutionized medicine.
5) Among those who are taking part in the work, he is probably the most active.

5. 两个句子的主语一致时，其中一个往往可以改写成分词结构作状语。
1) Every one of us had been convinced that the project was feasible by the time we left the meeting.
2) As Peter got home from the three-month-long journey to the Antarctic he looked tired out.