Answer:
We use the simple past to say what happened in the past, often in sequential order. The past perfect expresses events and actions that occurred prior to another past action (usually expressed in the simple past). In spoken English, it is common to use only the simple past and not the past perfect
Explanation:
simple He wrote He will write
continuous He was writing He will be writing
perfect He had written He will have written
perfect continuous He had been writing He will have been writing
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