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In an email, I came across

搭載されてます機能。。。

I understand how 「~ています」can get shortened to 「~てます」, but I thought this was informal (hence, contradicting the need for the 「~ます」 ending.

Also, I found it strange to be using a verb with a 「~ます」 ending as an adjective. What are the rules/nuances of using 「~ます」 like this?

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    I can't provide any sources, but the expression does not sound like a proper Japanese (my mother tongue). The use of "です" "ます" in the 連体形 is rather rare. I can only come up with "搭載されております機能", a very polite expression, perhaps used by a salesperson to their customers. "搭載されている機能は次のとおりです" (the functions equipped are as follows) does not sound rude at all.
    – Yosh
    Feb 11, 2015 at 7:54

1 Answer 1

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搭載されてます機能

If this was in a formal business email, I would say it's grammatical but overly casual. As you well know, the ています-to-てます-conversion is very common in casual and colloquial Japanese, but that's not something you can use in a business email.

They should have wrote in one of the followings ways:

  • 搭載されています機能
  • 搭載されております機能 (using humble おる)
  • 搭載されている機能

As you can see, using ます to modify the following noun like this is not uncommon.

That said, the last one is universally valid, and I personally prefer it even in a formal email. There is no need to use 丁寧語 there, and I feel that using the first form too much may leave an obsequious impression on people.

Of course you can safely say "搭載されてる機能" in a casual situation.

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