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hi there

I would like to have advise on the below usages(are in adjectives):
  1. Is come useful correct?
  2. Is come in useful correct?
  3. or just Become Useful no either one of the above.
beside,how to differentiate Come in handy & Come handy?

anyone could help???thanks a million...
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Become useful, and come in handy are the only phrases I've heard, among the several you've listed.
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Hi,

I've heard both 'become useful' and 'come in handy'. However, 'come in useful' is also used - Ref: http://dictionary.reference.com/browse/come%20in%20useful

Regarding 'come useful' and 'come handy', I think people either mistakenly or deliberately drop the 'in'. I could find no usage handbook officially supports them.
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Like Avangi, I've only heard "become useful" and "come in handy".

I would not consider "come in useful" to be a typically used collocation in American English. However, a search on the BNC indicates British usage.

I would consider both "come useful" and "come handy" to be incorrect.
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Thanks,for all of you......cheers

The usual North American idioms are "come in handy" and "turn out to be useful." "Come in useful," a perfectly correct British idiom that expresses the same thing, is immediately comprehensible though slightly off-sounding to many American and Canadian ears, although it has probably become more familiar even there, as it is frequently used by J.K Rowling.