The first type of idiom is not tested all that frequently, but the second type is. You may object to this second categorization right off the bat (another idiom), by noting that there were prepositions in the examples we already saw, and you'd be right. Nevertheless, this second category is devoted to those prepositions that must travel with certain verbs in order to make grammatical sense.
Here are some examples of idioms involving prepositions:
There's no particular reason why one would argue with someone, rather than argue against someone. Similarly, there's no particular reason why one turns out a light but doesn't switch out a radio. The last example demonstrates how a single verb requires different prepositions in different contexts.
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