"He was lost" describes the person's state of being lost, while "he got lost" describes the process of becoming lost.
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to be lost = the situation when you don't know where you are - I turned left on the street and then I realized I was lost.
to get lost = to lose one's way - I wanted to visit my friend, but I got lost on the way to his house.
2015年2月27日
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He was lost: the others can not find him
He got lost: he can not find the way