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The class I go to uses the «Minna no Nihongo» textbook, and according to it you can say the following in informal language:

そのカレーライスおいしい?

わたしは富士山にのぼりたい。

(See book 1, lesson 20)

So I gathered, the copula can be omitted in adjective-like predicates. However, when I posted on Lang-8 applying the new-found knowledge, people corrected me:

ドイツはいちども行ったことがないから、ずっと行きたかった行きたかったんだ or 行きたかっです

Hence, the question: why だ/です is necessary here? What's the general rule?

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私はご飯を食べます also doesn't have a copula, but is standard (textbook) Japanese. I think you are confused about the term "copula". If you are asking whether every sentence needs an instance of だ or です, the above sentence already gives a counter example... –  Earthliŋ Oct 5 '13 at 22:09
    
食べます being a full verb predicate doesn't need a copula. A copula, as I understand, is a verb to make predicates out of non-verbs like adjectives and nouns. E.g. Snow is white – "is white" is a predicate. –  katspaugh Oct 5 '13 at 22:24
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I see. So-called i-adjectives are also called adjectival verbs (or verbal adjectives) sometimes, because they can be inflected and (contrary to na-adjectives, also called adj. nouns or nominal adj.) they don't need a copula... –  Earthliŋ Oct 5 '13 at 22:52
    
@Earthling, どうもありがとう、分かりました! –  katspaugh Oct 5 '13 at 23:04
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1 Answer 1

up vote 3 down vote accepted

I think the confusion arises because です can both replace だ as the copula (行きたかったんです), or simply mark politeness (行きたかったです).

The correction you received has little to do with a grammatical need for だ or です in a sentence, but rather the two improved versions sound more natural.

Grammatically speaking,

ドイツはいちども行ったことがないから、ずっと行きたかった。

is perfectly fine.

You need a copula when you have a noun predicate. 行きたかったんだ needs だ because ん nominalizes the preceding phrase. 行きたかった alone doesn't need a copula, but may be marked with です for a more polite tone.

Your original sentence could be amended to

ドイツはいちども行ったことがなかったから、ずっと行きたかった~
I had never been to Germany and had been longing to go...

in which case you don't need んだ or です.

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Comprehended your answer after the second rereading. Thank you! –  katspaugh Oct 5 '13 at 22:39
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