PRESENT PERFECT + YET / ALREADY

 Present Perfect Tense - Already and Yet 

Already means that something happened earlier than we expected. With Present Perfect already usually goes after have or has and before the main verb.
Examples

   - We've already had our breakfast.

   - When are you going to do your homework?
   - But I've already done it!

   - Do you want a cup of coffee?
   - No, thanks. I've already had one."
Yet means that something that we expected has happened or hasn't happened. We usually put it at the end of a sentence.
Examples

   - Has the post arrived yet?

   - Have you done your homework?
   - Not yet.

   - Haven't you got ready yet? Look at the time!
Exercise. Do we use for or since with the following time references?
  • I haven't phoned home  Christmas.
  • We've been here  nine o'clock.
  • I have worked for International House  more than eight years.
  • I haven't visited my home town  I left school.
  • I haven't been to the cinema  ages.
  • I have studied non-stop  9.15.
  • I have had a driving licence  I was eighteen.
  • She hasn't had a day off  1999.
  • Johan has been in England  more than two weeks now.
  • Peter has been my best friend  we were nine.




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