Prepositions - Prepositions of Reference
These prepositions allow the speaker to refer to known information to support or elaborate their statements.
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by
used to indicate the source or reference from which information, standards, or rules are derived
[preposition]
re
used at the beginning of a business letter, etc. to indicate the subject of the letter, or an email that is a reply to a received one
[preposition]
apropos
used to introduce or qualify a relevant or timely comment or topic; with regard to
[preposition]
with reference to
used to indicate that something is being mentioned or discussed in relation to a particular subject, source, or context
[preposition]

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