villagers，The villagers have already known，，，，，，，，

The villagers have already known_________we’ll do is to rebuild the bridge. A．this B．that

试题分析：通过分析句子结构，可知这个句子中包含一个宾语从句，且引导词在从句中作宾语，表示什么的意思，故用what。
点评：在句子中起宾语作用的从句叫做宾语从句。宾语从句分为三类:动词的宾语从句,介词的宾语从句和形容词的宾语从句。解答这类题，首先要确定从句是什么从句，然后依据相应的语法规则答题。宾语从句中引导词的确定，要看它在宾语从句中作什么成分，有没有什么实际意义。

Have the villagers already known ________ we’ll do is to rebuild the bridge? A．this B．that

试题分析：考查名词性从句。known后跟宾语从句作宾语，宾语从句中包含一个主语从句________ we’ll do，do后缺少宾语，用what引导宾语从句并在从句中作宾语；this不能引导从句，that引导名词性从句，本身无意义，只起引导作用，which指“哪一个”，排除A、B、D，故选C。

the villagers have already known ____we will do is to rebuild the bridge.

你好，这句话真正的谓语是 to rebuild the bridge 即不定式to do 作宾语.应该这么理解 the villagers（ have already known ____we will do） is to rebuild the bridge.请你仔细看看，如果是宾从，就是一个句子，句子就有主谓宾，而且没有连词的话是不会有两个动词的。 do 和 is 一起出现就是错的。如果do是动词那么主语就是we，所以宾语应是do的对象，而不应加 is

The villagers have already known _____ we will do is to rebuil...

The villagers have already known _ we will do is to rebuild the bridge 为什么用that不可以

that不能引导宾语从句

The villagers have already known _ we will do is to rebuild the bridge

what，分析一下句子的成分：The villagers（主语) have already known(谓语）what we will do is to rebuild the bridge（整个是个宾语从句，这个宾语从句又是由what引导的主语从句构成的）。你可以理解为to rebuild the bridge is what we will do (但不是这样用）。

这个英语语法题为什么用what 而不用that呢

The villagers have already knownwhat we will dois to rebuild the bridge.

know 后面是宾语从句，（what we will do is to rebuild the bridge）

what we will do是宾语从句中的主语从句，主语从句中少了do的宾语，所以用what引导。

用that的情况是从句中不缺少句子成份。