(1)

Solid can be turned into liquid and liquid into gas if heated enough. =solid can be turned into liquid and liquid can be turned into gas if it is heated enough. 如果加到足够的热，固体会变成液体，而液体又会变成气体。

(2)

Have a little more if delicious. =You have a little more if it is delicious  如果好吃就多吃一点。

(3)

Make changes where necessary. =You make changes where it is necessary. 在必要的地方作些修改。

(4)

I won’t attend his party, though invited a few days ago. = I won’t attend his party, though I was invited a few days ago. 尽管几天前请了我，但我还是不会参加他的聚会。

2.

表示时间、条件、让步、方式等状语从句中，如果从句的主语跟主句的主语一致，就可将从句的主语省略，同时，将从句中的谓语动词变为分词形式。如：

(1)

He was very excited when told that he had passed the exam. =He was very excited when he was told that he had passed the exam. 当告诉他考试通过了时，他非常兴奋。

(2)

If running a little faster, he will take the first place. =If he runs a little faster, he will take the first place. 如果再跑快一点，他就会获得第一名。

(3)

They began to talk warmly as if being good friends. =They began to talk warmly as if they were good friends. 他们就好像是好朋友一样开始热烈地谈论起来。

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