Prepositions (Wrong) :
Common Errors Index
One of the clearest indications that a person reads little and doesn’t hear much formal English is a failure to use the right preposition in a common expression.
You aren’t ignorant to a fact; you’re ignorant of it. Things don’t happen on accident, but by accident (though they do happen “on purpose").
There are no simple rules governing preposition usage: you just have to immerse yourself in good English in order to write it naturally.
In the sentence “Alex liked Nancy, with whom he shared his Snickers bar with" only one “with" is needed—eliminate either one.
Look out for similarly duplicated prepositions.
Incidentally, an often-cited example of this pattern is from Paul McCartney’s Live and Let Die: “this ever-changing world in which we live in"; but if you listen closely, you’ll hear instead a quite correct “this ever-changing world in which we’re livin’."
Americans have a hard time hearing the soft British “R" in “we’re."
We have TWO more sections on Prepositions. See them as well.
Prepositions - 1
Prepositions - 2