找搭档。（将下列频度副词和相近的表频度的短语匹配起来）
sometimes
often
always
usually
five or six times a week
seven days a week
once or twice a week
three or four times a week

sometimes — once or twice a week
often — three or four times a week
always — seven days a week
usually — five or six times a week

我们可以根据频度副词的含义和频率高低来完成匹配：
1. sometimes 意为“有时”，表示动作发生的频率不高，和once or twice a week（一周一到两次）表意相近；
2. often 意为“经常”，表示动作发生的频率较高，和three or four times a week（一周三到四次）表意相近；
3. always 意为“总是”，是频率最高的频度副词，和seven days a week（一周七天，即每日都发生）表意相近；
4. usually 意为“通常”，表示动作绝大多数时候都会发生，频率仅次于always，和five or six times a week（一周五到六次）表意相近。