例如：

They reached a place where there were many trees and flowers. （where引导定语从句）

They were sent where they wanted to go. (where引导地点状语从句)

【考点透视 考例精析】

[考点] 考查引导主语从句、表语从句的连接词的用法。

[考例1] _________ she couldn't understand was _________ fewer and fewer students showed interest in her lesson.

A．What, why B．What, that C．That, why D．That, that

[解析] Ａ　本句的主语从句缺少主语，that不能引导主语从句并同时作主语，所以只能选what；第二个空缺表语从句的连接词，根据句子的意思，应该是一个表示原因的连接词，所以就是why。

[拓展] 引导主语从句时，that不做成分，但是还不能省略，这是一个值得注意的问题。因为that在引导定语从句作宾语及其它从句中是可以省略的；而that引导表语从句时也不做成分。

再如：

That he is a good official is known throughout the country. （that引导主语从句，不做成分）

The reason why he was late was that he had an unexpected visitor. (why引导定语从句；that引导一个表语从句。

[考点] 并列连词or的用法。

[考例2] Start out right away, ________ you'll miss the first train. [06 四川卷]

A．and B．but C．or D．while

[解析] Ｃ 解析：并列连词or表达的意义是 "否则, 要不然"。

[考点] 考查at表示一个时间点的用法。

[考例3] Don't call between 12 o'clock and 13 o'clock, _____________ I am usually having lunch.

A．at which B．at which time C． by which D．by which time

[解析] Ｂ　本题中的which引导一个定语从句，先行词为between 12 o'clock and 13 o'clock， at表示在12点和13点之间的某个时间，其表示的是一个"时间点"，所以选B。

[拓展] 英语中表示时间的介词大多是固定的，比如：in the morning/in the afternoon/in the evening, at noon/at night/at midnight, on the morning of next Wednesday/on the afternoon of last