Question

什么时候用what引导的主语从句

Answer 1

举个例，What he said so many years ago is so true today in this information age.他许多年前说过的话在今天这个信息时代仍是这般地正确。What he said so many years ago充当整个句子的主语，即你说的what引导的主语从句，what在从句中又作什么成分呢？显然是作宾语，说的内容对不对？就是说，引导词是看从句，它首先得保证从句是个完整正确的句子！what是个名词性的，充当主语或宾语，上面的例子是作宾语，再举个作主语的例子：What has been done is not important.

Answer 2

what引导的名词性从句中从句谓语动词的单复数情况：

what后面“什么时候用单数,什么时候用复数”根据动词后面的名词的单复数来定.

2.what引导的名词性从句做主语时，主句谓语动词的单复数情况：

(1)What在从句中做主语，主句谓语由what从句谓语决定。

1) What he’d like most for a birthday present is a camera.

(2)what在从句中做宾语，主句谓语由主句表语/宾语决定what they want are XX,XX&XX。

2) What his father left him are a few English books.

Answer 3

what可以单独引导主语从句，而which后面要有名词。比较一下：
what do you want doesn't matter to me。你想要什么，对我来说不重要。
which car do you like doesn't matter to me。which后面有car这个名词。你喜欢哪辆车对我来说不重要。

Answer 4

连接代词、连接副词和复合词引导主语从句时，本身有词义，在从句中往往充当主语、宾语、表语、定语或状语等，从句的语序用陈述句语序。例如：
What he needs is that book. （what 在主句中作need 的宾语）

Answer 5

what和which同为连接代词，两者都可在主语从句中作主语，宾语，表语。what在从句中有意义，什么。而which也有意义，哪一个。
例如：It is by no means clear——the president can do to end the strike.
A.how B.which
C.that D.what
分析：考查名词性从句的引导词。句中it是形式主语，主语从句中缺少do的宾语，故选择what作为主语从句的引导词且充当从句中谓语动词do的宾语。
例如：＿book you borrrow， you must return it in a week.
A.that B.what
C.which D.why
分析：borrow sb sth，缺少宾语，排除why，that.因为why作状语，that在句子成分完整时作主语，又因为句子中没有意义。what不符合句义，不能说‘’你借哪个书‘’，所以本题选C.