Why is 中 used in:

```

    送信中...
    
```

to mean that something is happening in the present moment. I see examples like
this a lot.

Why 中 and not "-te iru"?
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2018-04-01T04:53:14.540
57657
2018-04-01T06:19:46.630
29375
question
grammar
中 to mean present continuous. Why 中?
For kanji compounds like 送信【そうしん】 or 工事【こうじ】 or 販売【はんばい】, you can't just add
ている onto the end, since the base term is a noun.

This is vaguely like in English: you can't say _transmissioning_ , or
_constructioning_ , or _saleing_ , but you can say _**in** transmission_, or
_**under** construction_, or _**on** sale_. So instead of adding the _-ing_ ,
you add the _in_ or _on_ or _under_ (as appropriate for English usage).

In Japanese, you add the 中【ちゅう】, literally meaning "in the middle of
_[whatever word just came before]_ ".
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2018-04-01T06:19:46.630
57658
2018-04-01T06:19:46.630
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answer