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Sample Conversation:

A: How are you?

B: I am mad.

A: How come?

I thought that how come was a logical word choice but upon speaking with somebody for whom English is a second language, I found that they did not understand the meaning. I am wondering if using how come in this manner is a form of slang.

For some reason saying "How come you are angry?" sounds like bad grammar.

I can imagine the use of "How come, when I talk to you, you are angry?" to be correct with that added phrase in the middle.

So my question is, is using how come as in the example conversational slang? And also is "How come you are angry?" proper English?

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Reminds me of wherefore. –  Reid Aug 3 '11 at 0:51
1  
How come you to write thusly? –  user179700 Aug 3 '11 at 5:26
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4 Answers

up vote 11 down vote accepted

Looking in COCA, how come is very common in American English. It's used to mean why, in questions, and occasionally in statements:

How come the reporters aren't asking that?
And that's how come this song "This Land Is Your Land" became known throughout America.

If we break down the places it appears, a pattern emerges: how come is almost never used where formal writing is demanded, as in academic writing, but is frequently used where informality is okay, as in fiction dialogue and speech:

           TOTAL    SPOKEN  FICTION  MAGAZINE  NEWSPAPER   ACADEMIC
HOW COME   2689     882     1318     283       164         42  

In American English, at least, how come? is informal, but probably not considered slang.

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That is a cool site, I will show all my foreign friends, I'll be more confident giving them answers when they ask me specific questions hehe. Thank you for all your research :) –  Mallow Aug 4 '11 at 4:47
    
It's also fairly common in AuE. –  user867 Jun 25 at 3:15
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I would guess that "How come?" is simply a shortening of "How does it come to be (that)?".

Some digging finds the quotation in the 16th century Foxe's Book of Martyrs XII

After this, Tyndale corrected the same New Testaments again, and caused them to be newly imprinted, so that they came thick and threefold over into England. When the bishop perceived that, he sent for Packington, and said to him, "How cometh this, that there are so many New Testaments abroad? You promised me that you would buy them all."

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This sounds interesting--do you have any further information on this? –  simchona Aug 2 '11 at 23:05
    
+1 for the further information. –  simchona Aug 2 '11 at 23:40
    
"How does it come to be ..." I would not have found this on my own but this makes a lot of sense. Thank you I might add this strange structure into my vocabulary haha. :) –  Mallow Aug 4 '11 at 4:47
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So my question is, is using how come in the example conversational slang?

Yes, it is part of spoken speech, but very rarely in written speech.

And also, is "How come you are angry?" proper english?

No, "how come" is not proper English. It's colloquial, or informal. The actual phrase is "how came", as in:

How came you to be so angry?

But that sounds very archaic. Other possible origins are "How comes it to be..." or "How did it come about?"

The normal way to ask a question is "Why?"

A: How are you?
B: I am mad.
A: Why?
B: ...

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Colloquial that helps me alot thank you :) Thank you for the article. –  Mallow Aug 4 '11 at 4:52
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It's not even that unique. In German it's not uncommon to say and write: "Wie kommt es, dass..." Literally in English: "How comes it, that..." So, to my 'native german ears' the "how come" actually sounds proper. I remember that it just appeared/felt a little short, like incomplete (thus confusing or funny) to me, when I heard it the first time.

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