如：That he will come is certain. (主语从句)

I don’t know what you want. (宾语从句)

He made a suggestion that the work should be given to him. (同位语从句)

The question is how we should carry out the plan. (表语从句)

(1)首先判断是否是从句，及从句类型(可省略)，进行初步排除(如that的省略情况等);

(2)其次分析从句中是否缺主干成分，判断适用连接词(如缺主干，可选用what,

who, which;不缺主干成分可选用that, whether, when等);

(3)最后结合句子含义，同时根据连接词的自身用法确定恰当的连接词。

知识精练

Word came _____ the audience were not satisfied with the commercial performance.

A. where B. that C. what D. which

【答案】B。解析：

考查同位语从句。句意：有消息称，观众对商业演出不满意。分析句子结构，Word came是主句，空格及其后面的成分是同位语从句，解释说明word的内容;同位语从句主干完整，不缺成分，故用that引导同位语从句;that在从句中不充当成分，无意义，只起连接作用，但不能省略。故选B。