When I was young, I have lost my bag during school trip.
I had found that at Information desk, but there wasn't money in my bag.
So I was upset.
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-T. Julia
When I was young, I have lost my bag during school trip.
>> When I was young, I lost my bag during a school trip.
I had found that at Information desk, but there wasn't money in my bag.
>> I had found it at the Information desk, but there wasn't any money in my bag.
So I was upset.
>> Correct