Dear Seagull "List" is an interesting word because it can be considered as a surface (like a page - use "on"), or as a container of words (like a document - use "in"). For this reason, it is OK to use either "in" or "on", though "on" feels more natural and common. Kind regards, Michael
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seagullQ1 Are "in" in Sentence (a) and "on" in Sentence (b) interachangeable?I'd say so. Yes.
seagullQ2 On what criteria should we use "in" or "on" before "list"?Mostly on the mood you're in.
CalifJim Mostly on the mood you're in.It is good news to hear English grammar has such leeway even though it is usually very strict to us.