· we use the simple past tense of an action that continued for a period that ended in the past, and we use the present perfect of an … · the simple past tense doesnt in itself tell you whether an action was a one-off or repeated, so you use either an adverb, or … 知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品 … Simple和easy的区别有以下几点： 一、词义上的不同 1、simple adj. If + simple past + … 简单的；朴素的；单纯的；笨的 2、easy adj. · with respect to if-clause rules, i used to know that the modal verb would had to be paired with simple past:
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· we use the simple past tense of an action that continued for a period that ended in the past, and we use the present...
