在英语中，引导名词性从句的连接词有以下几种：

　　一、 that本身无意义，在所引导的名词性从句中也不作成分，所引导的从句如不作从句应是陈述句。

　　例如：The trouble is that she has lost her address.

　　这里的“she has lost her address”如不作从句就是一个陈述句。

　　二、 why(包括how,但whether除外)：本身有意义，在所引导的从句中作成分，所引导的从句如不作从句应是特殊疑问句。

　　例如：Do you know why he said that?

　　这里的“why he said that”是宾语从句，如不作从句应是：

　　Why did he say that?

　　三、 whether / if:本身有意义(是否)，在所引导的从句中不作成分，所引导的从句在不作从句之前应是一般疑问句、反疑问句和选择疑问句。

　　例如：1. He asked me whether / if I had been to Beijing.

　　这里whether / if所引导的宾语从句如不作从句应是：

　　Have you been to Beijing?或You have been to Beijing, haven't you?

　　2. Whether the meeting will be held in the meetingroom or in the open is not known to us.

　　这里whether所引导的主语从句如不作从句应是：

　　Will the meeting be held in the meetingroom or in the open?

　　四、 as if / as though, because:本身有意义，引导表语从句，在从句中不作成分，所引导的从句如不作从句应是陈述句。

　　例如：1. It looks as if / as though it's going to rain.

　　这里as if / as though引导的从句如不作从句应是：

　　It's going to rain.

　　2. It is because the earth is traveling around the sun. 这里because引导的从句如不作从句应是：

　　The earth is traveling around the sun.

　　五、 what= the thing(s) + that引导的定语从句： the person(s)

　　例如：1. He is still what he was (=the person that he was) what 引导表语从句。

　　2. What (=the thing that) he wants is only a book. what引导的是主语从句。

　　六、whoever, whomever, whosever, whatever, whichever:

　　例如：1. Whoever comes to see me will be welcome.

　　whoever = anyone who,在这里引导主语从句，在从句中作主语。

　　2. I'll do whatever I can to help you.

　　whatever = anything that，在这里引导宾语从句，在从句中作宾语。

　　3. You may take whichever book you need.

　　这里的whichever book = any of the books或either of the books, whichever引导宾语从句，在从句中作定语。

　　4. I will give you whatever book you need.

　　这里的whatver book = any book that, whatever引导宾语从句，在从句中作定语。

　　(文/万宪东； 英语辅导报高中教师版 04~05学年度第20期；版权归英语辅导报社所有，独家网络合作伙伴新浪教育，未经许可，不得以任何形式进行转载。)