"For" and "of" are two prepositions that are confusing for most beginner English learners. Come take a look and understand their differences!
FOR
(prep.) duration of time as in hours, days, and years.
Eg. I walked for about two or three hours.
It can also be used as a preset distance and purpose.
Eg. Johnny went to the doctor for his checkup.
OF
(prep.) used to show possession, belonging, or origin.
Eg. a friend of mine, the President of the United States, employees of the company
(AMOUNT) used after words or phrases expressing an amount, a number, or a particular unit.
Eg. a kilo of rice, both of us, a speck of dust
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