Which statement is grammatically wrong and why?
- She read the agreement as she would make sure there was nothing wrong in it.
- She read the agreement so that she would make sure there was nothing wrong in it.
The first statement is incorrect. In this usage, "as" denotes "to the same degree" (https://www.merriam-webster.com/dictionary/as). It would be more appropriate therefore to use "as" to describe how not why, e.g., "She read the agreement as if her life depending on it, making sure there was nothing wrong with it."
The second statement correctly uses "so that" to describe why. In that case, I would suggest the simplified, "She read the agreement to make sure nothing was wrong."
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The first statement can be interpreted in a correct way: as can be used in place of because, eg I eat something, as I am hungry. – Oliver Mason Jun 28 '18 at 13:25
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The first sentence would only be correct if rephrased to something like: She read the agreement, as she wanted to make sure there was nothing wrong with it. Note the addition of the comma and changed words. – Jason Bassford Jun 28 '18 at 17:37
