He had worked hard.
He worked hard.
I understand the grammar of both sentences, but i don't know when i should use the first sentence and when use the second.
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Let us assume that he worked hard over a period of time, perhaps over the course of a week, month or several years. Now, what is our point of perspective? From what point in time are we now looking back at this period of hard work?
If we are looking back from the present, simply say He worked hard.
If we are talking about a specific point in the past and looking back on an even earlier period of hard work, say He had worked hard.
For example: "He was rich. He had not always been so, but he had worked hard and by this time he could afford to relax."