Question

英语语法问题求解。。。谢谢了？

请问大家此句话里的 they speak in different situations是一个定语从句吗？它的关系词是什么呢？
Good speakers change the way they speak in different situations.

Answer 1

they speak in different situations 的确是一个定语从句，修饰the way，它的关系词是that，这是一种特殊情况，属于在表明方式的单词后面，用来代替in which。that也可以省去。关于这个问题的解答，我另发图片给你，供你参考学习。

Answer 2

我认为你的分析是正确的，其他问题回答如下：

1.because是从属连词，表示因果关系，可以引导原因状语从句，表语从句和主语从句。

2.it此处是普通代词，指代前文that。

it作为形式主语只是为满足语法上的需要，避免句子头重脚轻，它代替的是句子的逻辑主语，概括起来会有三种情况：不定式作主语、动名词作主语 和 名词从句作主语。

典型的句型如下：

从句作逻辑主语

It is so happened that the tickets were sold out.

It is extremely obvious that she has been lying about her identity.

It suddenly occurred to me that the message must have been hidden between the layers of the briefcase.

不定式作逻辑主语

It is very kind of you to give me a hand in time.

It is my pleasure to address the meeting.

It was pretty hard for him to bring up the child on his own.

动名词短语作逻辑主语

这类句子远不如前面两种出现率高，主要在（no good,waste,useless,no use,dangerous）等词语的后面用

It is no use reasoning with him.

It is no good reading in dim light.

也就是说，如果是在主从复合句中，it做形式主语一般出现在主句部分，后面带that或者of和for等介词。

此处并无此特征，判断为普通代词。

以上~~~

Answer 3

Good speakers change the way they speak in different situations.（优秀的演讲者会在不同的场合改变他们说话的方式。）（that）they speak是定语从句， in different situations是条件状语修饰change the way they speak。（that）是代替“介词+which”,介词的选择有时很费斟酌（像楼上选的就不一样），所以干脆用（that）代替，或省略不用。

Answer 4

该句是定语从句，关系代词that在从句中作宾语，被省略。

Answer 5

已经回复过相同的问题。
是定语从句，但不是省略了that的定语从句，而是省略了by which或者with which的定语从句。
by which或with which在句子中做方式状语。