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I hope this will help you inshaa'Allah. It is the English key to the Madinah Arabic Course, Book 3.
http://abdurrahman.org/arabic/Madina...nglish_Key.pdf
Go to Adobe pages 60 and 61, which equates to pages 56 and 57 of the book, for details on إِذَا and conditional sentences.
Go to Adobe pages 107 and 108, book pages 103 and 104, for another use of إِذَا .
Go to Adobe page 122, book page 118 for إِذْ.
And Adobe page 52, book page 48, explains the ظَرْف (adverb).
Hope that helps, inshaa'Allah.
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