選擇線上英語(yǔ)課程，可以讓自己掌握更多的知識(shí)，提升英語(yǔ)水平。今天和大家來(lái)分享的是英語(yǔ)語(yǔ)法知識(shí)當(dāng)中的主語(yǔ)從句(Subject Clause)， 主語(yǔ)從句即在主從復(fù)合句中充當(dāng)主語(yǔ)成分的句子。對(duì)此還不太了解的，今天可以一起來(lái)往下看看。

It is important.

That we all should attend the meeting is important.

It is important (that) we all should attend the meeting.

主語(yǔ)從句的連詞

1、連詞that(句首不可省略)，whether，if引導(dǎo)的主語(yǔ)從句。

That the earth is round is true.

It is true that the earth is round.

That you missed such an interesting film is a pity.

It is a pity that you missed such an interesting film.

That she is still alive is sheer luck.

It is sheer luch that she is still alive.

It remains unknown whether/if we will go for an outing tomorrow.

注意：whether/if含有“是否”的意思，可以加上“or not”，其語(yǔ)義不變。但如果主語(yǔ)從句位于句首則必須用連接詞whether，不用if。

If the meeting will be put off hasn't been decided yet. (X)

Whether the meeting will be put off hasn't been decided yet. (√)

It is still a question whether/if it is true or not.

Whether it is true or not is still a question.

2、連接代詞who，whose，what，which，wh+ever引導(dǎo)的主語(yǔ)從句。

Who will come to teach the students is not known.

Whom the watch belongs to is unknown.

Whose watch was lost is unknown.

Whatever he said wasn't true.

3、連接副詞 where，when，how，why引導(dǎo)的主語(yǔ)從句。

Where the library is to be built has not been decided yet.

When we start the work is an important question.

How this happened is not clear.

Why she was late for school is quite clear now.

注意：主語(yǔ)從句中的連詞不能重疊使用。

That whether we'll go camping tomorrow depends on the weather. (X)

Whether we'll go camping tomorrow depends on the weather. (√)

主語(yǔ)從句的語(yǔ)序

主語(yǔ)從句的語(yǔ)序用陳述語(yǔ)序

When will she come is not known.(X)

When she will come is not known. (√)

What we need is more time. (√)

What do we need is more time.(X)

主語(yǔ)從句的時(shí)態(tài)

主語(yǔ)從句的時(shí)態(tài)不受主句時(shí)態(tài)影響和限制。

What caused the accident remains unknown.

What he did yesterday will never be known by his mother.

It is certain that he will win the match.

It is suggested that the work should be done with great care.

主語(yǔ)從句的注意事項(xiàng)

1. 主語(yǔ)從句的謂語(yǔ)一般用單數(shù)形式;

When the meeting will be held haven't been known yet.(X)

When the meeting will be held hasn't been known yet. (√)

When he will come is a puzzle. (√)

2. What引導(dǎo)的主語(yǔ)從句，可根據(jù)表語(yǔ)決定主句動(dòng)詞的單復(fù)數(shù)形式;

What he needs is that book.

What he needs are some books.

3. What引導(dǎo)的主語(yǔ)從句一般不可以改為含形式主語(yǔ)的句子，that則可以;

What you said yesterday is right.

It is right what you said yesterday.(X)

That she is still alive is certain.

It is certain that she is still alive. (√)

4. 常見用it做形式主語(yǔ)的主語(yǔ)從句

It is known to all that the gunpowder was first invented by the Chinese.

It is true that he has made a very important discovery in chemistry.

It is important that we all should attend the meeting.

It is a pity that we won't be able to go to the south to spend our summer vacation.

It is doubtful whether she will be able to come.

It is said that he has gone to Shanghai.

It is still a mystery what caused the accident.

It seems obvious that we can not go on like this.

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