现在完成时态有两种用法:表示过去发生的动作对现在造成的影响和结果,常和already, yet等状语连用。表示从过去某时刻开始,持续到现在的动作或状态,常同表示一段时间的状语连用,如this week/month/year, in the past few /weeks/months/years, during the past few /weeks/months/years, these days, so far, up to now。时间状语也可以是since加一个过去的时间点,或for加一段时间,或by加一个现在时间。
◆我姐姐结婚五年了。
My sister has been married for 5 years.
需要注意的是在“this is the first/ second/ third…time that…”句型里要求用完成时。
◆这是我公司产品第二次参加国际展览会。
This is the second time that the products of our company have been shown in the International Exhibition.