形式主语从句是雅思写作中非常常用的一种句型。我们先来看一下它是怎样构成的。(That+一个完整的句子可做主语)。比如说：(That education is important ) is clear.这就是主语从句的基本形式。但如果句子要是这样，主语过长。所以，我们习惯于用it来代替原来的主语。而把原来的主语放在句子的最后。这句话可改为：It is clear that education is important.这就叫做形式主语从句。
以下的形式主语从句句型在雅思写作中都常常用到。希望大家能认真掌握，灵活使用。
1It is often the case that
2It’s a fact that
3It seems that
4It’s said that
5It’s reported that
6It’s believed that
7It’s universally accepted that
8It’s announced that
9It’s estimated that
10It must be admitted that
11It’s obvious that
12It must be stressed out that
13It is widely-accepted that
14It cannot be denied that
15It can be foreseen that
16It’s as clear as crystal that
17It goes without saying that
18 It is acknowledged that
19 It is well-known that
20 It is estimated that