【学会守法】 寻找标志词，巧学现在完成时

　　1. 以“for +段时间”为标志。如：
　　He has been away for two years.
　　他已经离开两年了。
　　值得注意的是，因for后接段时间，谓语动词一般要用延续性动词。如：
　　It seems that Mary ____ for almost an hour.
　　A. has gone   B. has set off   C. has left   D. has been away
　　(Key: D)
　　2. 以“since + 时间点/一般过去时”为标志。如：
　　He has been an English teacher since 1992.
　　自从1992年以来他一直做英语教师。
　　Mr Green has been at this school since he came to China.
　　自从到中国以来格林先生就一直在这所学校。
　　值得注意的是，“since+时间点”实际上也为段时间，谓语动词一般也要用延续性动词。如：
　　It is said that he has ____ since five years ago.
　　A. married   B. got married   C. be married   D. been married
  　(Key: D)
　　3. 以up to now/today, until now/today为标志。如：
　　I have still remembered him until now.
　　直到现在我还记得他。
　　This machine has been in use up to today.
　　这台机器一直用到了今天。
　　4. 以recently, lately, in recent years, all these days为标志。如：
　　He has studied very hard recently.
　　近来他学习很刻苦。　
　　She has been very busy in recent years.
　　近年来她一直很忙。
　　5. 以“in the past/last+段时间”为标志。如：
　　He has been in America in the past/last few years.
　　在刚刚过去的几年中他一直待在美国。
　　6. 以so far为标志。如：
　　He has been her good friend so far.
　　到目前为止他还是她的好朋友。
　　另外，现在完成时还常与never, ever, just, already 等词连用。如：
　　He has already got her help.
　　他已得到她的帮助。