科研之友
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摘要
<正>现在完成时是一个与过去时间和现在时间都有关系的时态,因此,具有这样特征的时间状语都可以与现在完成时连用。具体情况有以下几种:一、与表示一段时间的状语连用,如"for+时间段""since+时间点"。如:Mrs White has worked as a secretary in the company for five years.怀特夫人在这家公司当秘书已经五年了。I have had nothing to eat since lunchtime.从午饭时间到现在,我什么都没吃。This medicine has saved millions of people’s lives since it was put into use.
