急需八年级英语上册1-6单元的重点单词、短语、句型整理,越快越好...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 or...