講義：
用法一：how often 指每隔多久，主要用來對頻度副詞或狀語(如：once a week, three times a month 等)提問。如
-How often do you go to see the films?你多久去看一次電影？
-I hardly ever go to see the films.我幾乎從不看電影。
-How often does he help with housework?他多久幫忙做一次家務？
-Maybe four times a month.可能一個月四次。
用法二：常見頻率副詞
例：My sister never eats junk food.
我姐姐從不吃垃圾食品。
Ninety percent of the students always use the Internet.
90%的學生經常上網。
用法三：次數的表達方法
例：We go to school five times a week. 我們一周去學校五次。
The magazine comes out once a month. 這雜志一個月出版一次。
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