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The following examplatory sentence in the grammar section of my textbook:
どうして医者になりたいんですか。 ...医者は人を **助けるすばらしい** 仕事だからです。

It translates to (according to my textbook): Why do you want to become a
medical doctor? ...Because medical doctor is a great job in which you help
people.

What confuses me is that in the bold part, there is no connective form like て
form or ます stem. I know plain form as a way to make a verbal expression an
attribute to the related noun. In my textbook, it is said that a plain-form-
sentence + からだ expresses the reason(s) for an event. However, is it necessary
to omit other grammatical habits like the aforementioned て and ます form for
chaining verbal expressions inside the respective clause? I just want to avoid
being confused down the road when I'm encountering such constructions in the
wild :D
CC BY-SA 3.0
2017-07-24T08:30:28.153
51682
2017-07-25T11:13:32.503
20172
question
grammar
Why is there plain form in this sentence?
Because 助ける is used as a noun modifier of 仕事. When using a verb as noun
modifier, it's always in plain form.

If you were to use the て form it becomes:  
医者は人を助けて、すばらしい仕事だからです。 Which I think roughly translates into: "Doctors help
people, because it's a great job."
CC BY-SA 3.0
2017-07-24T10:47:33.723
51693
2017-07-24T10:47:33.723
25103
51682
answer
> > どうして医者になりたいんですか。  
>  ...医者は人を **助けるすばらしい** 仕事だからです。
>
> It translates to (according to my textbook): Why do you want to become a
> medical doctor? ...Because medical doctor is a great job in which you help
> people.
>
> in the bold part, there is no connective form like て form or ます stem.  
>  I know _**plain form as a way to make a verbal expression an attribute to
> the related noun**_.

I think you are talking about 連体形{れんたいけい} here, and this grammar point is the
answer to your case. The modifying adjective (すばらしい) might have caused your
confusion. The noun that is modified by a relative clause can also take other
adjectives.

> 医者は〔人を **助ける** 〕〔（すばらしい） **仕事** 〕だからです。

/

> In my textbook, it is said that a plain-form-sentence + からだ expresses the
> reason(s) for an event. However, is it necessary to omit other grammatical
> habits like the aforementioned て and ます form for chaining verbal expressions
> inside the respective clause?

Yes, we say 助けるからだ to express a reason, and yes, to connect a verb with the
particle て, or a helping verb like ます, た, etc., the verb form is conjugated to
the particular form (連用形{れんようけい}): 助けてくれた, 助けます, 助けた, etc. So, this form is
not to connect to a noun. It's like the English conjunction 'and':
彼は小さいころから親{おや}を **助けて働{はたら}いた.**
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2017-07-24T21:32:01.987
51720
2017-07-24T21:32:01.987
2020-06-17T08:18:27.500
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answer
It should be parsed as:

> 医者は［人を助ける］［すばらしい］仕事だからです。

人を助ける and すばらしい both modify the noun 仕事.  
人を助ける is a relative clause here.

［人を助ける］仕事 = a job [in which you help people]  
［すばらしい］仕事 = a [wonderful] job

You could also see it as ［人を助ける（すばらしい仕事）］, the relative clause 人を助ける modifying
the noun phrase すばらしい仕事.

Hence the translation:

"Because medical doctor is a [wonderful] job [in which you help people]."

A few examples with the same structure:

>   * ［友達に会える］［楽しい］場所 -- a [pleasant] place [where I can see friends]
>   * ［私の部屋にある］［かわいい］時計 -- a [cute] clock [in my room]
>   * ［あの子が履いている］［赤い］くつ -- [red] shoes [that the girl is wearing]
>

* * *

> I know plain form as a way to make a verbal expression an attribute to the
> related noun.

Correct. The plain form 助ける is the attributive form here and modifies the noun
仕事.

> In my textbook, it is said that a plain-form-sentence + からだ expresses the
> reason(s) for an event.

Precisely. 「医者は（人を助ける）（すばらしい）仕事だ。」 is a plain-form-sentence. ～～からだ/～～からです
added at the end means "Because~~" "It's because~~", indicating that the whole
sentence is a reason for some event or action.
CC BY-SA 3.0
2017-07-24T23:52:53.333
51721
2017-07-25T11:13:32.503
2017-07-25T11:13:32.503
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answer