How can I correctly capitalize this e-mail title: Unable to Log In to System

For bonus points, what are the parts of speech for the short words? I'm having particular difficulty with the word "to".


I'd use sentence case:

Unable to log in to system

(Actually, I prefer "log into", but see https://english.stackexchange.com/questions/5302/log-in-to-or-log-into-or-login-to - where the top-voted answer favours "in to" but admits that "into" is probably just as widely used.)

The rules for title case vary slightly among different style guides. It could be:

Unable to Log In to System

Lower case is usual for the shortest words ( http://blog.apastyle.org/apastyle/2012/03/title-case-and-sentence-case-capitalization-in-apa-style.html ), which would point to "in". However, although normally a preposition, "in" here is part of a phrasal verb and is behaving adverbially, so Chicago style at least would recommend "In" ( https://english.stackexchange.com/questions/169648/how-to-capitalize-get-out-of-in-a-title-according-to-cmos/170829#170829 ). I think that "Log In to System" looks slightly better than "Log in to System", although I dislike both.

You also asked about the parts of speech. You can find these in a dictionary. Traditionally, both "to"s would be classed as prepositions, although the first "to" is really better regarded as an infinitive-marking particle (as is now recognised by Oxford: https://en.oxforddictionaries.com/definition/to ).

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