本句是名词性从句在句中作主语,虽然是以it开头,但是it只起到形式主语的作用,真正的主语是that water was to be fundamental to the development of life。用it作形式主语是因为that引导的从句较长,如果按照正常语序来安排的话就显得头重脚轻了。类似的还有:
It is no wonder that he has passed the exam.
他顺利通过了考试 ,这一点不奇怪。
It is reported that Liu Xiang has scratched from the 110m hurdles with his hurt foot in the Olympic Games.
据报道,奥运会上刘翔因脚部受伤而退出110米栏的比赛。即境活用单项填空
①________he will stay in the company is what his friends most care about.
A.That
B.If
C.Whether
D.What
②After 5,000 years of history,________is no surprise that many Chinese people have become pretty set in their ways.
A.it
B.that
C.which
D.there
答案:①C ②A
2.Others, called amphibians, were able to live on land as well as in the water.
另外一些叫做两栖动物,他们既能在陆地上生活,也能在水里生活。
●用法拓展
(1)本句中others指的除了insects之外的land animals, 后面的called amphibians作定语修饰others。some...others常放在一起使用,表示“一些……一些……;有些……有些……”。如:
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