## Lesson 15
### New words and expressions 生詞和短語
1. customs n. 海關(guān)
- custom n. 風(fēng)俗習(xí)慣
2. officer n. 官員
- office n. 辦公室
3. girl n. 女孩，姑娘
- boy 男孩
- girlfriend 女朋友
- boyfriend 男朋友
4. Danish adj. & n. 丹麥的，丹麥人，丹麥語
- Denmark n. 丹麥
5. friend n. 朋友
> e.g. A friend in need is a friend indeed.患難見真情
- friendly adj. 友好的
- a friendly smile
6. Norwegian adj. & n. 挪威的，挪威人
- Norway n. 挪威
7. passport n. 護(hù)照
- pass v. 通過
- port n. 港口
- visa 簽證
8. brown n. 棕色的
9. tourist n. 旅游者
- tour v. n. 旅行
> -ist 表示“人”的后綴
- artist 藝術(shù)家
- scientist 科學(xué)家
### 將課文中句子的復(fù)數(shù)變?yōu)閱螖?shù)
```
Are you Swedish?
No,I am not.
I am Danish.
Is your friend Danish,too?
No she isn't.
She is Norwegian.
Your passport,please.
Here it is.
Is this your case?
No it isn't.
My case is brown.
Here it is.
Are you a tourist?
Yes,i am.
Is your friend a tourist too?
Yes,she is.
That's fine.
Thank you very much.
```
### 名詞變復(fù)數(shù)
英文中名詞分可數(shù)名詞和不可數(shù)名詞，可數(shù)名詞有單數(shù)和復(fù)數(shù)兩種形式，指一個(gè)以上事物時(shí)用復(fù)數(shù)。
#### 如何區(qū)分可數(shù)不可數(shù)
- 最可靠的是查字典
- 一般來說有具體形狀的事物是可數(shù)名詞
- 沒有固定形狀的是不可數(shù)名詞
#### 名詞變復(fù)數(shù)規(guī)則：
1. 一般名詞詞尾加-s構(gòu)成復(fù)數(shù)
```
e.g. friend-friends
case -cases
handbag-bandbags
umbrella-umbrellas
```
2. 以-s -x -ch -sh 和部分o結(jié)尾的詞詞尾加-es
```
e.g. dress-dresses
box-boxes
watch-watches
dish-dishes
tomato-tomatoes
potato-potatoes
photo-photos
```
3. 以輔音字母+y結(jié)尾的單詞把y變i再加-es
```
e.g. baby-babies
city-cities
```
- 注意：以元音字母+y結(jié)尾的單詞復(fù)數(shù)加-s
```
boy-boys
key-keys
```
4. 以-f,-fe結(jié)尾的單詞把-f,-fe變?yōu)関再加-es
```
wife-wives
wolf-wolves
```
5. man,woman及以其結(jié)尾的名詞把man變?yōu)閙en,woman變?yōu)閣omen
```
policeman-policemen
policewoman-policewomen
```
6. 不規(guī)則名詞復(fù)數(shù)需要單獨(dú)記憶
```
tooth-teeth
child-childen
```
