Unit One
1. How often do you exercise ? → How often + 助动词do(does或did) + 主语 + do sth. ? 疑问词how often是问频率(多经常), 在这里助动词do(does或did) 是起帮助构成疑问的作用
Every day / Once a week / Twice a month / Three times a month / Three or four times a month .
2. What do you usually do on weekends ? 第一个do 为助动词, 在这起帮助构成疑问的作用；而第二个 do 则是实义动词. I usually play soccer .
3. What’s your favorite program ? It’s Animal World .
4. What do students do at Green High School ? 第一个do 为助动词, 在这起帮助构成疑问的作用；而第二个 do 则是实义动词.
5. As for homework , most students do homework every day . as for...意思是“至于；关于”,常用于句首作状语,其后跟名词、代词或动词的-ing形式（即动名词）.如：
As for him,I never want to see him here. 至于他,我永远不希望在这里见到.
As for the story,you'd better not believe it. 关于那故事,你最好不要相信.
6. The results for “ watch TV ” are interesting .
7. Mom wants me to get up at 6:00 and play ping-pong with her . → want to do sth.意思是“想要做某事”；want sb. to do sth.意思是“想要某人做某事”.如：
Do you want to go to the movies with me?你想和我一起去看电影吗?
The teacher doesn't want us to eat hamburgers.老师不想让我们吃汉堡包.
8. She says it’s good for my health . → be good for...表示“对……有益（有好处）”.其反义为：be bad for.（这里for 是介词,后跟名词、代词或动名词）如：
It's good for us to do more reading. 多读书对我们有好处.
Reading in bed is bad for your eyes.在床上读书对你的眼睛有害.
9. How many hours do you sleep every night ?
10. I exercise every day , usually when I come home from school .
11. My eating habits are pretty good . 这里pretty相当于very .
12. I try to eat a lot of vegetables , usually ten to eleven times a week . → try to do sth.表示“ 尽力做某事 ” ,不包含是否成功的意思 / try doing sth. 表示“ （用某一办法）试着去做某事”. 如:You’d better try doing the experiment in another way. 你最好试试用另一种方法做这个试验.
13. My healthy lifestyle helps me get good grades . → help sb.(to) do sth.帮助某人做某事
14. Good food and exercise help me to study better . → help sb. (to) do sth.帮助某人做某事 / 这里better是well的比较级,而不是good的比较级
15. Is her lifestyle the same as yours or different ? ＝Is her lifestyle the same as your lifestyle or is her lifestyle different from your lifestyle ? → be the same as … / be different from …
16. I think I’m kind of unhealthy . kind of = a little / a kind of 意思是“一种”
17. What sports do you play ?
18. A lot of vegetables help you to keep in good health . keep in good health = keep healthy = stay healthy
19. You must try to eat less meat . → try to do sth. 表示“ 尽力做某事 ” , 不包含是否成功的意思 / less是little的比较级
20. That sounds interesting. 这是“主语+系动词+表语”结构的简单句.sound（听起来）,look（看起来）,smell（闻起来）,taste（尝起来）,feel（觉得）,seem（好象）,grow（变得） , get（变得）等词在英语中可用作系动词,后跟形容词作表语.如：
It tastes good. 这味道好.
The music sounds very sweet. 这音乐听起来很入耳.
The smoke grew heavier and heavier. 烟雾变得越来越浓了.
Unit Two
1. What’s the matter ? What’s the mater with you ? with为介词,后跟名词、代词或动名词.人称代词必须用它的宾格.
I have a cold / have a sore back / have a stomachache
2. You should lie down and rest / drink hot tea with honey / see a dentist / see a doctor .
3. I’m not felling well . 这里well表示身体状况,不能用good代替
4. When did it start ? About two days ago .
5. That’s too bad .
6. I hope you fell better soon . 这里better是well的比较级
7. Traditional Chinese doctors believe we need a balance of yin and yang to be healthy . 这里 to be healthy是动词不定式短语,作目的状语
8. Maybe you have too much yin . too much后跟不可数名词,而too many后跟可数名词复数
9. It’s easy to have a healthy lifestyle ,and it’s important to eat a balanced diet . → It’s easy to do sth . 做某事容易 / It’s important to do sth . 做某事重要
10. Everyone gets tired sometimes . 这里get连系动词,tired是形容词作表语,属系表结构
11. A sore throat can give you a fever . → give sb. sth . = give sth. to sb. 把某物给某人
12. Don’t get stressed out. It’s not healthy . 在这里get是连系动词,stressed out是表语
13. I have a toothache . I need to see a dentist . → need意思为 “需要” ,作实义动词时,后跟动词不定式,否定式为don’t /doesn’t / didn’t need (to do sth.) ；作情态动词时,只能用于否定句或疑问句中,否定式为needn’t(do sth.) ,除有过去式外,没有其它的形态变化
14. Eat a balanced diet to stay healthy . to stay healthy是动词不定式短语,作目的状语
15. I’m not feeling very well at the moment . at the moment = now
Unit Three
1. What are you doing for vacation ? I’m babysitting my sister .
Where are you going for vacation ? Italy .
这是现在进行时的一种比较特殊的用法,用来表示按计划或安排要做的事情,现在还没有去做.
2. Who are you going with ? I’m going with my parents . with my parents是介词短语,在这里作伴随状语,起修饰谓语动词are going的作用
3. When are you going ? I’m going on Monday .
4. What are you doing there ? I’m going hiking in the mountains .
5. How long are you staying ? Just for four days . I don’t like going away for too long .疑问词hwo long是对时间长短或事物的长度提问,在这里是对时间的长短进行提问.
6. Have a good time . = Enjoy oneself . 玩得开心、愉快
7. Show me your photos when we get back to school . → show sb. sth. = show sth. to sb. 把某给某人看
8. I’m going to Hawaii for vacation . for vacation是介词短语,在这里作目的状语,起修饰谓语动词的作用
9. What’s it like there ? 这里like是介词,而不是动词
10. Can I ask you some questions about your vacation plans ? → ask sb. sth . 问某人某事
11. Ben Lambert , the famous French singer , is taking a long vacation this summer ! → take a vacation 度假
12. He thought about going to Greece or Spain , but decided on Canada . → think about 考虑 / decide on 决定 这里的about和on都是介词
13. “ I always take vacation in Europe ,” he said . “ This time I want to do something different .” → (1). want to do sth. (2). 修饰不定代词(something , nothing , anything等)的定语常放在不定代词的后面
14. He plans to have a very relaxing vacation . → plan to do sth. 计划做某事
15. I’m planning to spend time in the beautiful countryside .
16. I just finished making my last movies . → finish doing sth. 完成做某事
17. I hear that Thailand is a good place to go sightseeing . to go sightseeing是动词不定式短语,作a good place的后置定语
18. She’s leaving for Hong Kong on Tuesday . → leave A for B 离开A地去B地
19. I want to ask you about places to visit China . to visit China是动词不定式短语,作places的后置定语
20. I’m planning my vacation to Italy this weekend . to Italy是动词不定式短语,作my vacation的后置定语
21. What should tourists take with them ? with them是介词短语,在这里作伴随状语,起修饰谓语动词take的作用
22. Where are you leaving from ? leave from 离开某地（注：from是介词）