英语句子成分有主语，谓语，表语，宾语，宾语补足语，定语，状语等。组成句子的各个部分叫句子成分。
顺序一般是主语，谓语，宾语，宾语补足语，而表语，定语，状语的位置要根据情况而定。
主语：可以作主语的成分有名词（如boy），主格代词（如you），动词不定式，动名词等。主语一般在句首。注意名词单数形式常和冠词不分家！
谓语：谓语由动词构成，是英语时态、语态变化的主角，一般在主语之后。不及物动词（vi.）没有宾语，形成主谓结构，如：We come.
宾语：宾语位于及物动词之后，一般同主语构成一样，不同的是构成宾语的代词必须是‘代词宾格’，如：me，him，them等
副 词 的 定 义: 副词是一种用来修饰动词,形容词,副词或全句的词,说明时间,地点,程度,方式等概念。
副 词 的 分类: 1) 时间和频度副词: now,then,often,always,usually,early,today, lately, next,last,already,generally,frequently, seldom,ever,never,yet,soon,too, immediately, hardly,finally,shortly, before, ago,sometimes, yesterday.
2) 地点副词:
here, there, everywhere, anywhere, in, out, inside, outside, above, below, down, back, forward, home, upstairs, downstairs, across, along, round , around, near, off, past, up, away, on.
3) 方式副词:
carefully, properly, anxiously, suddenly, normally, fast, well, calmly, politely, proudly,4) 程度副词:
much,little, very,rather,so,too,still, quite, perfectly, enough, extremely, entirely,almost, slightly.
5) 疑问副词:
how, when, where, why.
6) 关系副词:
when, where, why.
7) 连接副词:
how, when, where, why, whether.
副 词 的 用法：副词在句中可作状语,表语,短语。
He works hard.
他工作努力。
You speak English quite well.
你英语讲的很好。
Is she in ?
她在家吗?
Let's be out.
让我们出去吧。
Food here is hard to get.
这儿很难弄到食物。
副 词 的 位 置:
1) 多数副词都可以放在动词的后面,如果动词带有宾语,副词就放在宾语后面。
I get up early in the morning everyday.
我每天早早起床。
He gave me a gift yesterday.
他昨天给了我一件礼物。
She didn't drink water enough.
她没喝够水。
The train goes fast.
火车跑得快。
We can go to this school freely.
我们可以免费到这家学校学习。
They left a life hardly then.
当时他们的生活很艰难。
He has a new cat on today.
他今天戴了一顶新帽子。
I have seen this film twice with my friends.
这部电影我和朋友看过两次。
2) 副词修饰形容词,副词时,副词在前面,而被修饰的词在后面。
It's rather easy, I can do it.
这很容易,我能做到。
He did it quite well.
他做得相当好。
It's rather difficult to tell who is right.
很难说谁是对的。
It's so important that I must tell my friends.
这件事太重要了，我得告诉我的朋友。
It's much better.
好多了。
3) 频度副词可放在实义动词的前面,情态动词和助动词的后面。
I often help him these days.
这些日子我经常帮助他。
I always remember the day when I first came
to this school.
我常常记得我第一次来学校的那一天。
You mustn't always help me.
你不能老是帮助我。
He seldom comes to see us.
他很少来看我们。
We usually go shopping once a week.
我们通常一周买一次东西。
The new students don't always go to dance.
新学生并不时常去跳舞。
4) 疑问副词,连接副词,关系副词以及修饰整个句子的副词,通常放在句子或从句的前面。
When do you study everyday?
你每天什么时间学习?
Can you tell me how you did it?
你能告诉我你如何做的吗?
First, let me ask you some questions.
先让我来问几个问题。
How much does this bike cost?
这辆车子多少钱？
Either you go or he comes.
不是你去就是他来。
The students were reading when the teacher came into the classroom.
当老师进教室时，学生们正在读书。
5) 时间副词和地点副词在一个句中, 地点副词在前面时间副词在后面。
We went shopping in the supermarket at 9 o'clock yesterday.
昨天九点钟我们到超市买东西了.
What were you doing in the classroom yesterday evening?
昨天下午你在教室里干什么？
The accident took place one hour ago in the Eleven Avenue.
一小时前十一号大街发生了一场事故
定语是用来修饰名词的成分。
单词作定语一般要把单词放在这个被修饰词前面，介词短语、副词和句子作定语要放在被修饰词后面。
例如：
I like long pencil. long就做定语用来修饰pencil，表“长铅笔”。
I like the pencil on the table. on the table是介词短语，就要放在pencil后面，表“放在桌子上的铅笔”。
I like the pencil that i bought yesterday. I bought yesterday是个句子，也要放pencil后面，表“昨天我买的铅笔”。
句子做定语也就是定语从句。
The car downstairs is mine. downstairs 是副词，放 pencil后，表“楼下的汽车”。 指示代词（demonstrative pronoun）
是用来指示或标识人或事物的代词。
指示代词与定冠词和人称代词一样，都具有指定的含义。
1） 指示代词分单数（this / that）和复数（these / those）两种形式，既可作限定词又可做代词，例如：
单数 复数
限定词：This girl is Mary. Those men are my teachers.
代词： This is Mary. Those are my teachers.
2) 指示代词的句法功能；
a. 作主语
This is the way to do it. 这事儿就该这样做。
b. 作宾语
I like this better than that. 我喜欢这个甚至那个。
c. 作主语补语
My point is this. 我的观点就是如此。
d. 作介词宾语
I don't say no to that. 我并未拒绝那个。
There is no fear of that. 那并不可怕。
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