When using prepositions of reference and Manner I'm confused on how to explain when to use the "in" and "on" in a sentence like with in: MANNER: The child ran down the steps in tears. REFERENCE: In my opinion we need a referendum. They are happy in their marriage. How do i explain to someone why on wouldn't be used in any above or why in is used in those sentences? or with on: REFERENCE: He asked my opinion on the matter. CONDITION: We’ll hire him on your recommendation.

The phrase "For example" can it be used after the example? I always thought the phrase "For example" was supposed to be used before the example but sometimes I see it after the example? Like in this, "Executing pieces of an insertion order programmatically is a good idea as a means to secure coveted inventory in times of high demand -- like during the holidays or specific content windows, for example. " Can anyone explain why?

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