Expressions
always，usually，often，sometimes的区别
2. usually意为“通常”，表示通常如此，很少例外。 频度仅次于always，反义词为unusually。
eg：What do you usually do on Sundays? 你星期天通常干什么？ I usually got up at six in the morning last term. 上学期我通常在早上六点钟起床。
