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八年级新湘教版下 Unit7 Topic 2 if和whether的区别 辅导.

八年级新湘教版下 Unit7 Topic 2 if和whether的区别 辅导.
(1)if和whether都可以引导宾语从句,常常可以互换,表示“是否”。如:
I don’t know whether(=if)I should tell him.
我不知道是否应该告诉他。
(2)但两者也有微妙的差别,请注意 whether可与or not连用,而if不可以在句首时用whether,而不用if;在介词后用whether,而不用if;表示“如果”时用if,而不用whether。如:
I don’t know whether he will come or not.
我不知道他是否会来。
Whether you take part in or not the result will be the same.
你参不参加结果都是一样的。
It depends on whether he can solve the problem.
那取决于他能否解决这个问题。
He can’t decide whether to visit her or not.
他决定不出是否去看她。
Whether he will come is still a question.
他是否会来还是一个疑问。
3.例题分析。
1)Only one of the books is ____ .
A. worth to read B. worth being read C. worth of reading D. worth reading
此题答案为D。Sth.作主语时,be worth后应跟动名词,或sth. be worthy of being done。
2)Rather than_____ on a crowded bus, he always prefers ____ a bicycle.
A. ride; ride B. riding; riding
C. ride; to ride D. riding; to ride
此题答案为C。句子为“宁愿干……而不愿干……”的常用句型。
此类句型还有would rather do…than do…和prefer doing sth. to doing sth.
3)The chair looks rather hard, but in fact it’s very comfortable to _____.
A. sit B. sit on C. be sat D. be sat on
此题答案为B。句型为“主语 + be + adj. + to do”,常用不定式主动式代替被动式。如:
It was hard to choose.
很难决定啊。
若动词是不及物动词,要跟相应的介词,如:
The ice is hard enough to skate on.
这冰够硬,可以在上面滑冰。

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