Well, the most obvious difference is the number of arrangements. Do you have some specific sentences in mind?
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Anonymous"The school make an arrangement with local businesses."No, these are incorrect. The object of a verb (arrangement is no exception) does not determine the conjugation of the verb; the subject does.
Plan
"He family aremaking arrangements for his funeral."
anonymousI think there is some difference between "make an arrangement" and "make arrangements" and if you do not mind, could you tell me when you use the one or the other? Thank you so much as usual in advance.