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如何区分定语从句和同位语从句
用where，后面的是定语从句，如换成fact就变成了同位语从句，那就得用that了。
写一个同位语从句
We
heard
the
news
that
our
team
had
won.
我们听到消息说我们队赢了
They
were
worried
over
the
fact
that
you
were
sick.
他们为你生病发愁
语法问题
首先，bristles falling out既不能换定语从句，也不能换成同位语从句，因为它与前面的prevent构成固定词组。prevent sb/sth from doing sth或者是from being done表示阻止某人做什么或者是阻击，防止某人某事被怎么样。这里from省略了而已。
高中英语同位语从句教案
用法：同位语从句的先行词多为fact, news, idea, thought, question, reply, report, remark等，关联词多用从属连词that。Where did you get the idea that I could not come?你在哪儿听说我不能来？
1.He broke the rule that no one is allowed to smoke on campus. the rule是先行词，No one is allowed to smoke on campus是内容
2.When the Chinese basketball fans heard the news that Yao Ming collected forty points for the Houston Rockets in the game,they went wild with joy. the news 是先行词， Yao Ming collected forty points for the Houston Rockets in the game是内容
3.Mary left a message that she won't be able to see you off this afternoon with me for you.a message 是先行词，she won't be able to see you off this afternoon是内容
4.No one has any doubt about the fact that he is the right person for this job. .He is the right person for this job是内容，句中缺少先行词，用the fact
同位语从句偶尔由从属连词whether引导。如：
I have no idea whether he’ll come or not. 我不知道他是否来。
连接代词who, which, what和连接副词where, when, why, how亦可引导同位语从句。
The question who should do the work requires consideration.
谁该干这项工作，这个问题需要考虑。
We haven’t yet settled the question where we are going to spend our summer vacation.
到哪儿去度暑假，这个问题我们还没有决定。
It is a question how he did it.
那是一个他如何做了此事的问题。
注意与定语从句的区别
that只起连接从句的作用，无意义。在从句中不充当句子成分。不可省。
that替代先行词在从句中不仅起连接作用，还充当一个句子成分。如在从句中作动词的宾语时可省略。
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