主語從句就是在句中作主語，主語從句的位置與陳述句中主語位置相同的，統(tǒng)觀主語從句的考核占有相當比重，下面和小編具體來看一下that引導的主語從句吧！

在句中不做成分。當主語從句位于句首時，不能省略：
That he likes books of this kind is very interesting.= It’s very interesting (that)he likes books of this kind.
這是用的最多的一種主語從句,但把這種主語從句放在句首是很少的,只是為了強調(diào)或謂語較長時才這樣安排.例如：
That?prices?will go?up?is?certain.
That?she?is still?alive?is?a?consolation.

2.當謂語動詞是seem,appear,be a a wonder,be likely等時，使用形式主語It，而將真正的主語放在句尾，這時從屬連詞that可省略：It appeared to scientists on earth (that) the stars had moved.
還有一些例如：絕大部分主語從句都借助先行主語放到句子后部去.

a.It?+be?+?形容詞+that從句：
It is?natural?that?they?should?have?different?views.
It was?quite?obvious?that?she?didn’t?want?to?come.

b.It?+be?+?名詞?+that?從句：
It’s a?shame?that?you’re?sick.
It’s?a?pity?that?he?can’t?swim.

c.It?+?動詞（+?賓語或狀語）+?that?從句：
It happened?that?she?wasn’t?in?that?day.
It seems?that?you’re?right.

d.It?+?動詞的被動語態(tài)?+?that?從句：
It’s said?that?there?has?been?an?earthquake?in?India.
It’s reported?that?the?enemy?troops?have?crossed?the?border.