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4. 比較狀語從句中，常將從句中與主句中的相同成分省略。如：

(1) The weather in the south is much better than in the north. = The weather in the south is much better than the weather in the north is good. 南方的天氣比北方的天氣好多了。

(2) The Beijing you see today is much more beautiful than it was twenty years ago. = The Beijing you see today is much more beautiful than it was beautiful twenty years ago. 你今天所看到的北京比二十年前的北京漂亮多了。

注意：當比較的主句和從句都為及物動詞帶賓語時，從句省略后，留下的代詞用主格或賓格時，意思不同。如：

He likes the dog better than she. 他比她更喜歡那條狗。

He likes the dog better than her. 他喜歡那條狗甚于喜歡她。

因此，從句的主語若為名詞，省略謂語部分后須加助動詞do 的適當形式，否則就會產生歧義。如：

He likes his dog better than his wife does. 他比他的妻子更喜歡那條狗。

He likes his dog better than his wife. 他喜歡那條狗甚于喜歡他的妻子。

5. 名詞性從句中的一部分省略。如：

(1) He was late this morning, but I don’t know why. 他今天早晨吃到了，但我不知道他遲到的原因。

(2) He got here this morning, but do you know how? 他今天早晨就到這兒了，但我不知道他是怎么來的。

6. 主句中的一部分省略。如：

(1) Glad to hear that you succeeded in finding the answer. 聽說你成功地找到了答案，我很高興。

(2) What if he did come today? 要是他今天不來，那怎么辦呢？

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