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1.in:过……后(未来时间) 注意 如果用于过去时，用after +时间。 She went to Nanjing last May，and she came back after a month. 去年五月她去了南京，一个月之后她又回来了。 大多用在将来时(一般将来时和过去将来时)。 in an hour 一小时之后 in a week or so 一个多星期之后 He will be back in five hours.他五小时之后回来。 They said they would arrive here in a week.他们说他们一周后到达。 2.within:不超过……的范围 比较 within和in with in强调在……时间之内，没有时态的限制。 in是以现在为基准，in an hour是指从现在起1小时之后，所以一般只用于将来时。 within 3 hours 3小时之内 I must finish painting the cat within five minutes.我必须在五分钟之内画好这只猫。 They worked hard. They finished the work within 2 days at last.他们努力工作，结果终于他们在两天之内完成了这项工作