three days later 和 after three days 用法一样吗?

three days later, three days after (after为副词=later)与after three days用于过去时态时是没有什么区别的。不过要注意以下几点:

1. 副词later 或after:可用于时间段之后,但不可用于时间点之后。表示从过去或将来算起的多久以后,不指从现在算起的多久之后。例如:

He finished his work two hours after. 他两小时之后完成了工作。(过去为起点的两天之后)

He'll arrive in Wuhan tomorrow and two days later he'll leave for Lanzhou. 他明日抵达武汉,而两天后他要去兰州。(明天为起点的两天之后)

2. 介词after:后面既可接时间段也可接时间点,接时间段用于过去时态,接时间点用于过去或将来均可。例如:

She married after two years.两年后她结婚了。(时间段)

She came back home after two o'clock. 她两点钟之后回到了家里。(时间点)

She will come back home after two o'clock. 他两点钟之后将会回到家里。(时间点)

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