五年级英语语法讲解
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发布时间:2024-10-23 22:32
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时间:2024-11-05 13:35
在过去的时段内,当两个事件发生时,若前者先于后者,则前者的动作需用过去完成时表达。这一时态的结构是“had+过去分词”。例如,在她完成作业之后,她才去购物。这可以写作:After she had finished her homework, she went shopping。
同样的语法结构还体现在这样的例子中:他们在我询问价格之前就卖掉了那辆车。这可以写作:They had sold the car before I asked the price。
再比如:火车在我到达车站之前已经离开了。这可以写作:The train had left before I arrived at the station。
需要注意的是,在使用“after/before”引导的时间状语从句时,如果从句位于主句之前,需要在从句后加逗号;而如果从句位于主句之后,则无需加逗号。例如:After she had finished her homework, she went shopping。这里从句在主句之前,因此需要加逗号。而这个句子也可以写作:She went shopping after she had finished her homework。这里从句在主句之后,不需要加逗号。
掌握这些规则有助于更准确地使用过去完成时,从而提高英语表达的准确性和流畅度。