学英语语法不求人系列
英语词汇中有一类词叫频率副词，通常修饰动词，表示动作在一定时间内发生的次数，比如always, usually, often等词汇，都可以解释为“常常，总是”，但它们的用法却不一样，还有rarely和seldom，意思都可以解释为很少，但是用法各异，需要认真加以区分。
今天介绍一组频率副词，这些频度副词所表示的动作频率从高到低依次递减，举例如下，一起通过对比学习来区别这些单词的用法。
always 始终，一直
usually 通常，往往
often 经常
sometimes有时（= on occasion, every now and then）
seldom很少（= rarely）
hardly ever 几乎从不
never 从不
以上副词与 be 动词连用时，位置在 be 动词之后；若与其他动词连用时，位置在该动词前。但是 usually 和sometimes 需置于句首。
1. wash your clothes （用How often 进行提问）
How often do you wash your clothes?
2. clean your room （用How often 进行提问）
How often do you clean your room?
3. wash the dishes （用How often 进行提问）
How often do you wash the dishes?
4. have a haircut （用How often 进行提问）
How often do you have a haircut?
5. go to the cinema （用How often 进行提问）
How often do you go to the cinema?
1. He is late for school. (never) 用括号中的单词或短语改写句子。
He is never late for school.
2.It"s very cold in winter. (usually) 用括号中的单词或短语改写句子。
It"s usually very cold in winter.
3. They go to the park. (sometimes) 用括号中的单词或短语改写句子。
They sometimes go to the park.
4. My father washes the dishes. (seldom) 用括号中的单词或短语改写句子。
My father seldom washes the dishes.
5. Mom cooks for us. (always) 用括号中的单词或短语改写句子。
Mom always cooks for us.
6. They play football on Saturday afternoon. (Sometimes)
Sometimes they play football on Saturday afternoon.
他们有时在星期六下午踢足球。
根据汉语完成对话。
Betty: __1__ （经常）do you play soccer, Tom?
Tom:I play soccer __2__ . （一周两次）I __3__ （有时候）play baseball.
Betty: I like tennis. I __4__ （一直）play it with my friends.
Tom: I __5__ （从不）play tennis. I don"t like it. Do you often play the piano?
Betty: I have to play the piano __6__ （每天）. I"m __7__ （一直）busy.
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