While I haven't been around in a while, I'm surprised to see this being used on a question like this. In general, this close reason, which reads:
Questions asking for someone to find and correct errors or improve the phrasing are considered requests for proofreading and are off-topic. Please edit your question to focus on something in particular that you are unsure about; if that's not possible, see websites for proofreading instead.
The first question is not asking for someone to "find and correct errors" or to "improve the phrasing" - they're asking for help understanding what the correct usage of prepositions in a couple examples is... and they specifically emphasize that they're curious about the use of about - which is seen in the fact the word "about" is in bold and the question title mentions they want to know whether the preposition is needed or not.
The second example is again focused on a specific aspect of a sentence they're working to construct - sentences and are trying to determine whether the prepositional phrases are necessary in the two cases.
If either must be closed (which I would question) I think the Details, please! close reason fits much better and guides the user in how to improve the question because it links to the very helpful FAQ here on meta - Please, everyone ... details. Please! - that said, I'm not convinced these closures makes sense. They seem like bare-bones questions that could use an edit for really understanding the content but I don't think they need to be closed. There's enough info there to be a reasonable question.
Again, I've been gone for a while and I'm not sure what the current expectations are but I'm a bit confused by the usage of close votes here and kinda want to recommend rewriting them to make them either more clearly narrow to the proofreading case or more broad and informative if this sort of closure is actually intended.