英語(yǔ)句子成分－主語(yǔ)講解 什么是主語(yǔ)？
主語(yǔ)相當(dāng)于句子的話題或主題，即要說(shuō)明的人或物。主語(yǔ)一般位于句首，且不能省略。但在某些特定的句式里，如：疑問(wèn)句倒裝句祈使句感嘆句等，句子主語(yǔ)也可以位于謂語(yǔ)動(dòng)詞之后或省略?！鞠胍幌搿磕男┰~類或短語(yǔ)可以用作主語(yǔ)？（答：能用來(lái)做主語(yǔ)的有：名詞、代詞、數(shù)詞、動(dòng)名詞或動(dòng)名詞短語(yǔ)、動(dòng)詞不定式或動(dòng)詞不定式短語(yǔ)、主語(yǔ)從句等。）
1.名詞（或名詞詞組）
My pen is green. (單數(shù)可數(shù)名詞)
Jane is an American girl. (專有名詞)
2.代詞
I am a student. (主格人稱代詞)
Her pen is blue, and mine is red.（名詞性物主代詞）
These are my books. (指示代詞)
Who is not here today? (疑問(wèn)代詞)
Nothing was wrong with his eyes. (不定代詞)
3.數(shù)詞
Two and one is three. (基數(shù)詞)
The second was a tall man. (序數(shù)詞)
4.動(dòng)名詞
Eating too much is bad for your health. (動(dòng)名詞)
Playing games is much better than staying at home. (動(dòng)名詞短語(yǔ))
5.形容詞
The rich are not always happy.(少數(shù)形容詞前邊加the 相當(dāng)于名詞)
6.動(dòng)詞不定式
To see is to believe.(動(dòng)詞不定式)
It will take you 2 hours to get to the station.(it作形式主語(yǔ)，動(dòng)詞不定式短語(yǔ)作真正主語(yǔ))
7.主語(yǔ)從句（僅作了解）
What the teacher said yesterday is important.
△幾個(gè)常見(jiàn)加the后可以名詞化的形容詞是：poor, rich, young, old，happy,blind, beautiful等。
△主語(yǔ)和謂語(yǔ)的順序有兩種：（1）自然順序，即主語(yǔ)在前，謂語(yǔ)在后；（2）倒裝語(yǔ)序，即謂語(yǔ)或謂語(yǔ)的一部分在前， 主語(yǔ)位于其后。例如：
Are you a student？
Do you like English songs?
What do you speak?
There is a bird in the tree. (there be 句型)
Here is your pen. (以副詞here/there開(kāi)頭的句子習(xí)慣上主謂倒裝)
There stands a policeman.