Which preposition is used with convert: to or into? For example, convert the requisition into (or to) a PO.
closed as unclear what you're asking by Brian Hooper, TrevorD, p.s.w.g, JLG, Mitch Jul 27 '13 at 2:13
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Examining these pairings:
The examples marked with an asterisk do not work. The example with the question mark comes across oddly. The rest of them are perfectly fine.
The reason why the asterisk examples don't work is because in those cases it sounds like you are now a religion and your car is a wisp of gas. The questionable example comes across oddly for the same reason, except that it sounds like your car used to consist of gasoline but now it is is going to be blown away in the next wind.
So, the answer is, with "convert" you can usually use "into" and "to" interchangeably, but not in all cases, and there may not be an explicable rule for recognizing those exceptional cases.
As @p.s.w.g comments, either can be used in most contexts. Neither preposition is "better" than the other, and there's no difference in meaning. But as this chart shows, into is still more common (though to is gradually catching up)...
That's the situation when to convert is used to mean to change [something] into another form, substance, state, or product. But when it means to persuade or induce [someone] to adopt a particular religion, faith, or belief (or simply to adopt a religion), it's almost always to...