Sentence: While I arranging books in order, I ran across some of old books...

[Rameshreddy]

could any one help me to correct this sentence? If they are any corrections please explain me the mistakes which I committed.

While I arranging books in order, I ran across some of old books which I thought that they were lost.

[Alan]

Hi,

Let me rewrite:

While I was arranging books in some sense of order, I ran across some old books which I thought had been lost.

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Rameshreddy]

could any one help me to correct this sentence if it has any mistake

While arranging the books in order, I ran across some old books which I thought had lost.

[Mister Micawber]

While organizing the books, I ran across some old volumes which I thought had been lost.
.
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Native English teacher at Mister Micawber's