Is it inadequate to use "a couple of things" in a formal letter? If so, what word or phrase would work better?
I`m writing to inquire about a couple of things regarding my new job placement.
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'a couple of things' may not be appropriate in formal letters, especially because of the word 'things' which is used for everything without a specific meaning. I would recommend using 'a few/several/a couple of aspects/ issues', and if possible use a specific word that describes and substitutes 'things'.
Eg: We discussed a few demands, which are relevant for us.
Compare with: We discussed a couple of things which are relevant for us.