usual(ly)

1.He came at one o'clock as usual和He came later than usual等句子里的usual不可改作usually。在as或than后面省去was，但通常不加上was。但He is now more than usually happy里的usually当然不可改作usual。

2.as usual和usually意思不同。as usual指一次的事，如That day he came at one o'clock as usual。usually指经常的事，如He usually came twice a week。usually可以改作as a rule。例如：As a rule he came twice a week.

3.下面两句意思相同，但第二句比第一句语气重（am重读）：

• I am usually at home in the evening.
• I usually am at home in the eveing.