1、often:经常;主要修饰动词,也可修饰其他副词或形词,指某件事情在不同场合下屡次发生,具体的时间意味不强。
可用于一般时态,也可用于完成体。用于一般现在时态。
2、always:通常总是;接名词或代词作宾语。也可接以形词充当补足语的复合宾语。用于一般过去时。Work always piles up at the end of the year.年底总是积压一大堆工作。There's always a lot of traffic at this time of day.每天这个时候总是有很多来往车辆。This kind of question often appears in the exam.这类问题在考试中经常出现。As often as not, he's late for work.他上班往往迟到。