第589天 现在完成进行时与现在完成时的区别 2

• 现在完成时通常只陈述事实，而现在完成进行时可表示一种感情色彩
  I have waited for two hours.
  我已经等了两小时。（陈述事实）
  I have been waiting for two hours.
  我已经等了两个小时。（等得很辛苦）

• 表示状态的动词不能用于现在完成进行时。
  I have known him for years.(正确)
  I have been knowing him for years.(错误)
  I have been a teacher for 5 years.(正确)
  I have been being a teacher for 5 years.(错误)

秘诀：所谓现在完成进行时，就是在现在完成时的基础上添加进行时，强调这段时间一直在进行的概念。