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Technology
 

Technology

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    Technology Technology Presentation Transcript

    • Technology. Is it part of our lives?
    • Cellphones
    • Look at your text on page 26
      What tense is the verb in each sentence in italic?
      Present perfect
      Is the action or situation in each sentence finished?
      No
      Which sentence focuses on a situation up to now?
      Cellphones have been around
    • Present Perfect
      We use it to talk about actions or states that began in the past and are continuing now.
    • Can you give me an example?
    • Difference between simple past and present perfect
      Do not use the present perfect when you want to talk about a finished time in the past like yesterday or three days ago. Use the past simple instead.
      The present perfect is generally used when we are giving recent news, and there is a connection with the present. On the contrary, we use the simple past to give older information: we are only talking about the past.
    • He has failed his driving test again. (This is new information)
       He failed his exam two times last year (This is old information)  
      I have been ill all the week. (There is a connection with the present)
      I was very ill last summer. I had 'flu. (No connection with the present)
    • Let’s see if you understand the difference
      http://www.eflnet.com/grammar/presperf1.php
      http://esl.about.com/library/quiz/bl_pastorperfect1.htm?lastQuestion=0&answers=0&submit=Next+Question+%3E%3E&ccount=0
    • In present perfect we can use: since / for
      for + period
      A period is a duration of time, for example:
      5 minutes, 2 weeks, 6 years. For means "from the beginning of the period until the end of the period." For can be used with all tenses.
      since + point
      A point is a precise moment in time, for example: 9 o'clock, 1st January, Monday. Since means "from a point in the past until now." Since is normally used with perfect tenses.
    • Do we use since or for with these time expressions?
      Christmas
      Last night
      The last thirty minutes
      2009
      Three years
      This evening
      My last birthday
    • Let’s play in teams
      Thanksgiving
      Three years
      Last summer
      30 years
      The last twenty minutes
      This afternoon
      My last birthday
      1989