For, Since, During or Ago
For is used when we talk about a period of time
example:
I have worked for 3 hours

example:
I have worked since 8 o'clock

example:
I worked 2 days ago


Compare:
He called her during her break and talked to her for more than twenty minutes.
Exercise 1: past time expressions
Exercise 2: choose the right words
Exercise 3: prepositionsof time – during, over, for, by, until
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