proofread : correct the sentences

which one is grammatically correct and why
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1)
I wrote a book when I was in USA
I had written a book when I was in USA

2)
postman bought  a letter.   It was given to your mother.
postman  bought a letter.It has been given to your mother.
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mac_gAdmin - Oracle Fusion Middleware suiteAsked:
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Rob HensonFinance AnalystCommented:
Both are correct but dependent on context.

I would however use "in the USA"
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mac_gAdmin - Oracle Fusion Middleware suiteAuthor Commented:
@Rob,  I didn't get your 2nd line in comment,  Kindly explain

Question has added with one more sentences .. appreciate if you can reply that too..
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Rob HensonFinance AnalystCommented:
"I wrote a book when I was in USA"

would be better as

"I wrote a book while I was in the USA"

By context I mean that it depends on the rest of the text with it. If its just a statement of fact then the sentence above will be OK; if its the start of an explanation for a series of events then the second option might be better with the amendment "while I was in the USA".

The second statement you have used the wrong word. Bought is the past tense of buy; it should be brought, the past tense of bring. The second half of that sentence, both are correct.

The postman brought a letter. It was given to your mother.
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mac_gAdmin - Oracle Fusion Middleware suiteAuthor Commented:
sorry ..I miss spelled  the word "Brought"

you mean, second sentence also correct  - "postman brought a letter.It has been given to your mother."
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Rob HensonFinance AnalystCommented:
Yes, the second sentence is also correct but seems a bit lengthy although it is only one word longer.

By the way, whilst on the subject, misspelled (US English) or misspelt (UK English) is only one word.
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Rob HensonFinance AnalystCommented:
Strange coincidence that where I am in southern UK the word "brought" is often used incorrectly for the word "bought".
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Rob HensonFinance AnalystCommented:
You can combine the two statements into one sentence:

The postman brought a letter which was given to your mother.
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fred hakimRetired ITCommented:
The postman delivered a letter to your mother.    If the mother got the letter from the drop herself.  

The postman delivered a letter, I gave it to your mother.   If you (or someone)  got the letter and gave it to her.
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