例句： 1He bought 2three books 3yesterday.
- Who bought three books yesterday?
- What did he buy yesterday?
- When did he buy three books?
1they wanted to go 2to BeiJing 3by air.
- who wanted to go to BeiJing by air?
- Where did they want to go by air?
- how did they want to go to Beijing?
使用疑问词 how long, how far, how often, why
They have been in China for three years.
- How long have they been in China?
It is about 4 kilometers from BeiJing to Xian.
- How far is it from BJ to XA
They come to visit me once a week.
- How often do they come to visit me?
She came late, because she missed the bus.
- Why did she come late?
- How long have they leaned English?
- How often do you watch movies?
- How far is it from your home to school?
- 可数名词，指数的过来的名词。 例如：apple, pencil, student
- 不可数名词，无法计算的数量或抽象概念。 例如：salt, coffee, water, history, love.
- 可数名词有单数和复数之分，例如：apple-> apples, pencil-> pencils.
- 一般末尾加上 -s，例如： friend -> friends
- 以 s, z, x, ch, sh结尾的词加 -es, 例如： bus -> buses
- 辅音字母+Y 结尾，将Y变为I，加 -es, 例如: candy -> candies
- 以O结尾的名词，不是外来词或者缩写的，就加 -es。例如: tomato -> tomatoes
- 可数名词前加 a（an） 或量词。
apple -> an apple -> apples -> a box of apples
tomato -> a tomato -> tomatoes -> a bag of tomatoes
- 不可数名词前，不可加 a（an），没有复数，但前面可以加量词。
coffee -> a cup of coffee
- He bought me a box of chocolate. 一盒巧克力，巧克力不可数名词。
- He bought me a bike. 自行车，可数名词。
指示代词：标识人或者事物的代词，用来代替前面已经提到过的名词。 this(these), that(those)
- This is his book.
- Those apples were his.
不定代词：指代不确定的人或事物。one, the other, some, any, something, nothing, each
- No one knows where he is.
- Some of the boys want to go to BJ,But the others want to go to SH.
- Each of the students has got a book. 每个学生都有书了。
- These teachers are from China. 复数
- I know nothing about this person.
- I have something to tell you.