note

1. He has been walking ____ four hours.

   
   
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2. I've been learning English ____ two years.

   
   
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3. John has been collecting stamps ____ 1980.

   
   
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4. They've been playing ____ two o'clock.

   
   
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5. Nick has been studying maths ____ ten years.

   
   
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6. Brian has been smoking ____ he was 18.

   
   
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7. They have been living here ____ the war

   
   
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8. I haven't seen him ____ a long time.

   
   
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