1.in + 2006(2007...)常用于一般过去时,而in +(a week, a month, a minute等)常用于将来时态。
例如:⑴ Tom joined the army in 2006.
⑵ He said he would come back in a few days.
2.现在完成时和过去完成时都是完成时,但前者是相对现在而言,后者是相对过去而言。
例如:⑴ Weve learned 1,400 English words.(相对现在来讲)
⑵ We had learned 1,400 English words (by yesterday).(相对过去时间来讲。)
3.一般将来时和过去将来时都是将来时,但两者分别是从现在或过去来看将来发生的动作或存在的状态。
例如:⑴ Hell have his hair cut tomorrow.(从现在某时来看。)
⑵ He said he would have his hair cut the next day.(从过去某时来看。)
4.一般过去时表示过去发生的动作或存在的状态,和现在没有联系;现在完成时表示过去发生的动作或存在的状态对现在造成的影响和结果,和现在有联系。
例如:⑴ He went to town yesterday. (说明进城这个动作昨天已发生,和现在没有联系。)
⑵ He has had breakfast.(说明吃饭这个动作对现在来说已经完成了。)
如能有意识地进行比较和鉴别,将有助于我们从整体上把握各种时态的用法。
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