Unit 2 How often do you exercise?
本单元的语法：1.复习一般现在时;
2.学习表示频率副词的用法。
一、频率副词
a.主要频率副词：always(总是) > usually (通常) > often(经常) > sometimes(有时) > hardly ever(很少) > never(从不)
b. 位置：一般放在助动词、be动词或情态动词之后，行为动词之前。
Peter is always late for school. Peter上学总是迟到。
I usually do my homework in the evening. 我通常在晚上做作业。
c. 提问频率副词用 How often
How often do you watch TV?
I watch TV every day.
二、重点短语
1.on weekends在周末
2.go to the movies去看电影
3.help with housework帮助做家务
4. how often多久一次
5. hardly ever几乎从不
6. once a week每周一次
7. twice a week每周两次
8. use the Internet用互联网
9. be free有空
10. stay up late熬夜
11. at least至少 at most 至多
12. after school 放学后
13. be good for对……有好处 be bad for 对……有害处
14. go camping去野营
15. ask sb about sth：问某人某事 ask sb to do sth
My parents often ask me about my study.
我的父母经常问我的学习情况。
16. in one's spare time在某人业余时间
17. go online上网=surf the Internet
18. the answer to+名词：…的答案 (不定式做定语）
19.more than (=over)超过，多余
20. go to the dentist去看牙医
三、短语讲解
1. 数字+percent of+名词”做主语时，后面的单词取决于名词的情况。若名词为复数，后面的动词用复数形式;若名词为单数或不可数名词，后面的动词用单数形式。
In our class ,twenty of students are boys.
Thirty of water is dirty.
2. not…at all:一点儿也不 (not在句中的位置就是帮忙构成否定句）
I don't like the movie at all.
3. the (best) way to do sth: 做某事的(最好)方式 （这里可以理解为不定式作定语，不定式来修饰前面的名词）
The best way to learn English is speaking English.
学习英语的最好方法是说英语.
4. such as 和for example的区别
such as比如 (后跟名词或名词短语) for example 例如(后跟句子)
He likes fruits,such as apples,bananas and so on.
He has some good ways to study English,for example ,he often listens to tapes.
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