一、单数代词 a 和 an 的用法
I am a boys.
I（代词） = “我” 的意思，代词功能主要用来代替名词；例如用“I”来代替自己的名字。
am（动词） = “是” 的意思；am在英文中算是动词的一种，属于be动词。
be动词有三种，（is）、（am）、（are）都代表“是”的意思。常用代词和be动词的搭配。
I am —— 我是
you are —— 你是
he is —— 他是
she is —— 她是
it is —— 它是
this is —— 这个是
that is —— 那个是当开头发元音“a”、“e”、“i”、“o”、“u”的单词时，就必须用an 取代 a。
二、复数代词及复数名词的用法
we、you、they代表两人以上，所以be动词“is”应改为"are"。
名词的复数形式为结尾加“s”或者“es”。常用复数代词
“我们 - we”、
“你们 - you”、
“他们 - they”、
“这些 - these”、
“那些 - those”、
“我们是 - we are”、
“你们是 - you are”、
“他们是 - they are”、
“这些是 - these are”、
“那些是 - those are”、
由于都是附属代词，所以be动词为are，而不是is。复数名词的特殊变化规则
词尾是“s”，必须加上"es"
词尾是"y"，必须去掉“y”，改成“ies”
词尾是“f”or “fe”，必须去掉"f"或“fe”，改成“ves”
例：规则变化
boy 男孩 boys 男孩们
monkey 猴子 monkeys 猴子们
不规则变化
you 你 you 你们
man 男人 men 男人们
一、一般单数名词 词尾 + “s”
girl —— girls
cat —— cats
book —— books
二、词尾是s + "es"
bus —— buses
三、特殊不规则名词
a —— men
you —— you 单复数名字都是“you”
四、词尾是 “f” 或 "fe" 的单数名词
“f” 改为 “ves”
thief —— thieves
“fe” 改为 “ves”
knife —— knives
五、去掉 “y” 改为 “ies”
baby —— babies
四、一般疑问句
英语的疑问句，必须将be动词（am/are/is）移到句首。
技巧：先想肯定句，再变成疑问句。She is a doctor.
Is she a doctor?
You are busy.
Are you busy?
I am tall.
Am I tall?
He is a smart teacher.
Is he a smart teacher?
七、人称代词所有格
my - 我的
your - 你的
his - 他的
her - 她的
its - 它的
our - 我们的
your - 你们的
their - 他们的
例句：It is my table.
Is it my table?
Yes , it is my table.
I am your teacher.
Am I your teacher?
No , you are not my teacher
That is his house.
Is that his house?
Yes , that is his house.
That is her desk.
Is that her desk?
No , that is not her desk.
That is our desk.
Is that our desk?
Yes , that is our desk.
This is their dog.
Is this their dog?
No , this is not their dog.These are your chairs.
Are there your chairs?
No , these are not our chairs.
Those are our friends.
Are those our friends?
Yes , those are our friends.
My student is tall.
Is my student tall?
Your teacher is short.
Is your teacher short?
His father is happy.
Is his father happy?
Her sisters are sad.
Are her sisters sad?
Its ear is red.
Is its ear red?
Our doctor is busy.
Is our doctor busy?
Your piano is white.
Is your piano white?
Their driver is lazy.
Is their driver lazy?
八、What疑问句与专有名词
将What前置到句首。
一般疑问句只要将am，are，is放到句首就可以，但What疑问句，必须将What前置到is，am，are之前的句首位置，形成疑问语气。
例：What is this?
This is a book?
What is your name?
My name is Susan.
What is his name?
That is his name.
专有名词第一个字母必须大写，且，不能用"a"来代表数量。
“专有名词”的常用种类有几类。人名：John；地名：Beijing；国家：American；语言：English。
例：What is your name?
My name is John.
What are you from?
I am from Beijing.
九、Why 疑问句的用法
Why疑问句是用来询问对方原因的问句。
初学的学习步骤：
Step 1 ：先想肯定句
Step 2 ： 再改成疑问句
Step 3 ：再改成有Why的疑问句。
例如：
Step 1 先想肯定句
中文：约翰是伤心的。
English：John is sad.Step2 再改成疑问句
中文：约翰是伤心的吗？
English：Is John sad?Step3 再改成有Why的疑问句
中文：为什么约翰是伤心的？
English：Why is John sad?例句：His cat is dirty.
Is his car dirty?
Why is his car dirty?
That table is small.
Is that table small?
Why is that table small?
Your brother is sick.
Is your brother sick?
Why is your brother sick?
十一、连词because的用法
because在英文中属于连词，连词就像两个车厢之间的挂钩，用来连接两个句子，目的在于让整句语义更完整。
because的用法一：
句1 + because + 句2注意：because位于句中时，不用加逗号。
例：
他是聪明的 + 因为 + 他是一位科学家
He is smart because he is a scientist.
他是伤心的 + 因为 +他是生病的。
He is sad because he is sick.
例句：
那个农夫是瘦的。
That farmer is thin那个农夫是瘦的吗？
Is that farmer thin?为什么那个农夫是瘦的？
Why is that farmer thin?那个农夫是瘦的因为他是生病的。
That farmer is thin because he is sick.你是虚弱的。
You are weak。你是虚弱的吗？
Are you weak?为什么你是虚弱的？
Why Are you weak?我是虚弱的因为我是生病的？
I am weak because I am sick.because的用法二：
because可以放在句首作为火车头，后面挂载两个车厢，将句子连在一起。
因为只讲因为，没有所以。因此because放在句首时，句中加逗号当做所以来分隔。例：
因为 + 他是生病的， + 他是伤心的
Because he is sick , he is sad.
例句：
我的学生们是聪明。
My student are clever.我的学生们是聪明的吗？
Are my student clever?为什么我的学生们是聪明的？
Why are my student clever?因为你是聪明的，你的学生们是聪明的。
Because you are smart , your student is smart.这张书桌是好的。
This desk is good.这张书桌是好的吗？
Is this desk good?为什么这张书桌是好的？
Why is this desk good?因为这张书桌是干净的，它是好的
Because this desk is clean , it is good.
十二、Who疑问句的用法
Who放在句首，且放在am , are , is之前形成疑问语气。
中文说他是谁，英文说谁是他。例：
中文：那个男孩是谁？
English：谁是哪个男孩？
Who is that boy?例句：
Who is that postman?
That postman is my father.Who is that driver?
That driver is my uncleWho is his grandmother?
His grandmother is Mrs.Lin.
十三、How疑问句与fine的用法
because的用法一：
How 通常是问候对方 身体状况如何，用法和“What”，“Why”，“Who”等疑问句相同。fine（形容词） = “好的”意思。回答 身体状况很好，通常不用 good ，而是用 fine。
例：
中文：你好吗？
中文：你是“身体如何”？
英文：“身体如何” + 是 + 你
How are you?中文：你的祖母好吗？
中文：你的祖国“身体如何”？
英文：“身体如何” + 是 + 你的祖母
How is your grandmother?
My grandmother is fine.
例句：
How is that postman?
That postman is fine.How is that baby?
That baby is fine.How is your friend?
My friend is fine.How is Mary?
She is fine.because的用法二：
How + 形容词 = 形成不同意思的问法。How可以和其他形容词结合，例如： How + old = 多老？ 几岁？ 的意思。
How + new = 多新？的意思
用法和How相同。例：
中文：你的父亲多大年纪呢？
中文：你的父亲是多老？
英文：多老 + 是 + 你的父亲？
How old is your father?例：
中文：这家钢琴是多新呢？
英文：多新 + 是 + 这家钢琴。
How new is this piano?例句：
How tall are you?How angry is my mother?
How old is his grandmother?
How honest is your student?
How busy is that postman?
How sad is our teacher?
How big is that dog?
How beautiful is that airplane?
How stupid is my son?
How lazy is your daughter?
十三、Where疑问句的用法
"Where"用来确认对方的地方，所以句尾语调要下降。用法和“What”、“Who”、"Why"一样。
例：
中文：我的老师在哪里？
英文：“在哪里” + 是 + 我的老师？
Where is my teacher?中文：你在哪里？
英文：“在哪里” + 是 + 你？
Where are you？例句：
Where is Mary?
玛丽在哪里？Where are you?
你在哪里？Where are they?
他们在哪里？Where is that doctor?
那位医生在哪里？Where is that male waiter?
那位男服务员在哪里？Where is my cup?
我的被子在哪里？
十五、介词in的用法
介词用语表达物体之间相互之间的“相对位置”。
in（介词） = “在……里面”的意思。in后面搭配空间（盒子、屋子等……）
例：
中文：那只猫在我的房间里。
英文：那只猫 + 是 + in + 我的房间里
That cat is in my room.中文：那本书在我的汽车里。
英文：那本书 + 是 + 在我的汽车里。
That book is in my car.例句：
Where is your sister?
你妹妹在哪里？My sister is in her room.
我妹妹在他的房间里。Is your sister in her room?
你妹妹在她的房间里面吗？Yes , she is.
是的，她在。Why your sister is in her room?
为什么你妹妹在她的房间里？She is in her room because her is tired.
他在她的房间里，因为她是疲倦的。
Where is that person?
那个人在哪里？That person is in my house.
那个人在我的房子里。Is that person in your house?
那个人在你的房子里吗？Yes , he is.
是的，他在。Why is that person in your house?
为什么那个人在你的房间里？That people is in my house because he is my husband.
那个人在我的房子里，因为他是我的丈夫。Where is your father?
你的父亲在哪里？My father is in his office.
我的父亲在他的办公室里。Is your father in his office?
你的父亲在他的办公室里吗？Yes , he is.
是的，他在。Why is your father in his office?
为什么你的父亲在他的办公室里？He is in his office because he is busy.
他在他的办公室里因为他是忙碌的。Where is that friendly waitress?
那位友善的女服务员在哪里？That friendly waitress is in that bookstore.
那位友善的女服务员在那家书店里。Is that friendly waitress in that bookstore?
那位友善的女服务员是在那家书店里吗？Yes , she is.
是的，她是。Why is that friendly waitress in that bookstore?
为什么那位友善的女服务员在那家书店里？She is in that bookstore because her son is in that bookstore.
她在那家书店里，因为她的儿子在那家书店里。Where is that healthy baby?
That healthy baby is in her car.
Is that healthy baby in her car?
Yes , he is.
Why is that healthy baby in her car?
That healthy baby is in her car because she is his mother.Where is that monkey?
That monkey is in my classroom。
Is that monkey in your classroom?
Yes , it is.
Why is that monkey in your classroom?
It is in my classroom because it is my pet.
十六、介词in的用法
on 这个借此 = “ 在 …… 上面 ”的意思，但这个所说的上面，并不是“漂浮在东西的上空”，而是必须接触到东西的表面，才可以使用“ on ”来说明。
例：
中文：那个苹果在你的椅子上。
英文：那个苹果 + 是 + “ on + 你的椅子 ”
That apple is on your chair.例句：
That book is on your desk.Is that book on my desk?
Yes , it is.
Why is that book on my desk?
That book is on your desk because it is your book.
That dog is on her table.
Is that dog on her table?
Yes , it is.
Why is that dog is on her table?
That dog is on her table because it is hungry.
十七、其他常用介词
at
在……地点beside
在……旁边near
在……附近under
在……正下方over
在……正上方below
在……下方above
在……上方at（介词） = "在……地点旁边"
at 后面通常会加上一个“地点”，
例：在车站 = at + 车站， 意思是"在车站的旁边"
例：
中文：他在那个车站。
英文：他 + 是 + 在那个车站旁边
He is at that station.beside（介词） = “在……东西旁边”
beside指靠得很近，有“靠在东西旁边”的意思。
例： 靠在约翰旁边 = beside + 约翰
例：
中文：那只猫在你的婴儿旁边
那只猫 + 是 + “beside + 你的婴儿”
That car is beside your baby.near（介词） = “在……东西附近”的意思，距离较远
例：
中文：我的房子在那个公园附近
英文：我的房子 + 是 + “near + 那个公园”
My house is near that park.under/below （介词） = “在……东西下面”
“under” 是 强调 “ 在 ……正下方”，
而 “ below”只是说明 “ 在下方”。
例：
中文：他的盒子在车下。
英文：他的盒子 + 是 + 在车下
His box is under the car
His box is below the car.over/above（介词） = “在……东西上方”。
“over”强调在“正上方”；
“above”强调“在……上方”。
例：
中文：那个气球在你的房子上方。
英文：那个汽车 + 是 + 在你的房子上方。
That balloon is over your house.
That balloon is above your house.强调：在树上有两种写法。
“属于树本身的东西”，如果实、叶子用“on”
而“在树枝间穿梭的小动物”，如鸟、猴子用“in”
例：
中文：那个苹果在树上。
英文：那个苹果 + 是 + “on + 树”
That apple is on the tree.
例：
中文：那只猴子 + 是 + 在树上
英文：那只猴子 + 是 + “in + 树上”
That monkey is in the tree.例句：
That key is in that box.
那把钥匙是在那个盒子里。Is that key in that box?
那把钥匙是在那个盒子里吗？No , it is not.
不，它不在。That key is on your table.
那把钥匙在你的桌上。Her dog is at that store.
她的狗是在那个商店旁边。Is her dog at that store?
她的狗是在那个商店旁边吗？No , it is not.
不，它不在。Her dog is beside your husband.
她的狗是在你的丈夫的旁边。Your house is beside this park.
你的房子是在这个公园旁边。Is your house beside this park?
你的房子是在这个公园的旁边吗？No , my house is not beside this park.
不，我的房子不是在这个公园旁边，My house is near this park.
我的房子是在这个公园附近。That balloon is below this tree.
那个气球是在这棵数下面。Is that balloon below this tree?
那个气球是在这棵树下面吗？No , it is not.
不， 它不在。That balloon is above this tree.
那个气球是在这棵树的上方。That butterfly is over his head.
那只蝴蝶是在他的头的正上方。Is that butterfly over his over?
那只蝴蝶是在那张桌子的正上方吗？No , it is not.
不，它不在。That butterfly is under that table.
那只蝴蝶是在那张桌子的正下方。That bird is in that tree.
那只鸟是在那棵树上面。Is that bird in that tree?
那只鸟是在那棵树的上面吗？No , it is not.
不， 它不在。That bird is beside that window.
那只鸟是在那扇窗户的旁边。