how often should you clean your chimney

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Diablo

how often should you clean your chimney

often与usually的区别:表示的时间程度不同。体现在: 1) usually (75%)意为“通常”,着重表示已形成习惯的动作,反义词为unusually. 2)often (50%)相当于at times, 意为“时常,经常”。表示常常这样,但 … often是 频率副词,和sometimes,always,never,frequently等一样表示习惯性。 1、often后接动词原形用于 一般现在时: 例:I often go to the library on Sundays. 我经常星期天去图书馆。 2、often后接 … · how often 指 “每隔多久,多久一次做。。。”, 主要用来对 频度副词或状语 (如:once a day, three times a week 等)提问。 如:A:How often does he come here? 他 (每隔)多久来一 … 经常英文:often 、frequently、regularly 1、often 读音:英 [ˈɒfn] 美 [ˈɔ:fn] adv.经常;常常;时常;再三 比较级: more often 最高级: most often 例句:People often have incorrect information about food. 人 …

How often should you clean your chimney?

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