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  • 1. Technology. Is it part of our lives?
  • 2. Cellphones
  • 3. 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?
    Which sentence focuses on a situation up to now?
    Cellphones have been around
  • 4. Present Perfect
    We use it to talk about actions or states that began in the past and are continuing now.
  • 5. Can you give me an example?
  • 6. 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.
  • 7. 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)
  • 8. Let’s see if you understand the difference
  • 9. 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.
  • 10.
  • 11. Do we use since or for with these time expressions?
    Last night
    The last thirty minutes
    Three years
    This evening
    My last birthday
  • 12. Let’s play in teams
    Three years
    Last summer
    30 years
    The last twenty minutes
    This afternoon
    My last birthday