八年级上册英语第一二单元知识点,要全。我们要考试了!答:疑问词how often是问频率(多久一次),(在这里助动词do(does或did) 是起帮助构成疑问的作用)与一般现在时或一般过去时连用,回答一般是用表示频率的副词,如:once, twice, three times…, sometimes, often, quite, often, never, every day, once a week , twice a month , three times a month , three ...