【概念】
never, hardly ever, sometimes, often, usually, always 等频度副词用来表示动作频率或情况出现的经常性程度。一般来说可按频率大小排列为：
【例句】
1.The twins were never late for school last year. 这对双胞胎去年上学从没有迟到过。
2.I can’t ski, so I hardly ever go to the mountain to ski.我不会滑雪，所以我很少去山区滑雪。
3. My mother is sometimes busy. （=Sometimes my mother is busy.）我妈妈有时很忙。
4.He often goes for a walk after supp er. 晚饭后他常去散步。
5.What do y ou usually do on Sunday?你星期天通常做什么
6.He always thinks of oth ers. 他总是为别人着想。
