We aften have English lessons in the language lab.
Do you often have science class in the laboratory?
辨析：
1.always意为"总是,一直".这是频率最大的词,表示动作重复,状态继续,中间没有间断.
如：Mary is always late for school.玛丽总是上学迟到.
2.usually意为"通常",表示习惯动作,频率仅次于always,相当于most often.表示除个别情况
外,基本上没有变化.
如：He usually gets up at 6 o'clock.他通常6点钟起床.
3.often意为"时常,经常",表示动作重复,中间有间断,表示发生的频率比usually要小,但比
sometimes要大.
如：I often go to school by bike,but sometimes I go to school by bus.
我经常骑自行车去上学,但有时也会乘公交去上学.
4.sometimes意为"有时",表示发生的频率最小.
注：Distinction between "sometimes"（有时） and "sometime"（在过去某时）
区别：sometimes 和 sometime
He has lunch in the factory sometimes.他有时候在工厂里吃午餐.
I read this story sometime.我在过去某个时候看了这本书.
