Question

观察下列句子，试着归纳其画线部分所包含的句型结构。

1．Two-thirds of the earth’s surface is water．

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2．A quarter is the same as 25 percent(25％)．

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3．It is hard to think of a world without metals．

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4．This will keep air out of the water．

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Answer 1

答案：
解析：

　　1．分数作主语时谓语动词的数

　　2．the same as…

　　3．It is＋adj．＋to do

　　4．keep＋宾语＋宾语补足语