that→ what

　　意思是“这就是我兄弟以前常常跟我说的”，在表语从句中作tell的宾语，故用连接代词what。

　　4. It makes the book so extraordinary is the creative imagination of the writer.

　　It→ What

　　引导主语从句并在从句中作主语，用连接代词what。 5. From space, the earth looks blue. This is how about seventy-one percent of its surface is covered by water.

　　how→ why

　　因“71%的地表为水所覆盖”是“地球看起来是蓝色”的原因，故用because引导表语从句。请比较：About seventy-one percent of its surface is covered by water。This is why the earth looks blue from space. 6. It suddenly occurred to him he had left his keys in the office.

　　在he前加that

　　句中it作形式主语，that 引导主语从句。

　　7. As many as five courses are provided, and you are free to choose whatever suits you best. whatever→ whichever

　　指在前面提到的五种课程中“任选一种”, 有选择范围，要用whichever引导宾语从句，并在从句中作主语。 whichever与whatever的区别，类似于which与what，有范围用which，无范围才用what。 8. It doesn’t matter if you pay by cash or credit card in this store.

　　if→ whether

　　因whether...or…(不管……还是……)是固定搭配。

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