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Prepositions are function words like "to", "over", "through", "in". The meaning of a sentence can be dramatically altered by choosing the wrong preposition. Questions need to include enough information for the intended meaning to be deduced.

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"As of this morning" vs. "as at this morning"

"as of" can be ambiguous. "as of" and "as from" can easily be understood in their meanings of "valid from this time onward". "as at", by contrast, means "this information was valid at that particular …
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