There was another time I was having a problem understanding some drasha (explanation) of the Sages about a verse about returning lost objects. [I know a lot of people have questions understanding how the Sages derive things from verses.] This was an usually difficult problem because it seemed to me very much not like the verse in question. And he showed to me how the verse in question was impossible to understand simply. It was about a lost object that some had been hired to watch (in Exodus 22). And the verse then goes on to say כי הוא זה, "A person loses an object like this." Where is the this if the object was lost? After that I began to notice things myself of why or how the Sages make a drasha (explanation). The book that deals with this is the Torah Temima by the son of the Aruch Hashulchan. But the things that I noticed were in cases where the verse changes the way it treat a noun as male or feminine.  Or leaves out a necessary "את" "Et." Without the sages saying so they will see in these cases a reason to look at why the verse changes the gender of something.