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For example, やらなければならない can modify 時 to form やらなければならない時 and I know that the
adjective い ending can simply have a noun appended after it.

However when it's contracted to やらなきゃ can I simply add a noun after it and
pretend that the ない ending still exists even though it has been contracted and
elided? Will it still maintain the meaning of "(The) time where you must act"
or will なきゃ be forced to take on the meaning of "unless" as in a similar
manner reflected in the answer to [Difference between ~なきゃ and
~なくちゃ](https://japanese.stackexchange.com/a/4216/542)?
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2012-02-28T15:53:45.483
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question
grammar syntax contractions relative-clauses ellipsis
Does contraction and elision affect formation of relative clauses?
[Some](http://yokkunfund.blogspot.com/)
[people](http://www.amazon.co.jp/%E3%82%84%E3%82%89%E3%81%AA%E3%81%8D%E3%82%83%E6%90%8D%E3%81%8B%E3%82%82%EF%BC%81%EF%BC%9F%E3%81%AE%E3%82%B2%E3%83%BC%E3%83%A0%EF%BD%97/lm/RQI27Y1LJCT9)
[do](http://togetter.com/li/259110) use nouns after やらなきゃ.

> For example, something like: やらなきゃ詐欺{さぎ}だ. i.e. _"it is necessary fraud"_  
>  (or, _"it is fraud that I have to do"_.)

But if anything, I normally see something like 〜いけない come after something like
やらなきゃ. (And then, after 〜いけない placing a noun, or perhaps, a clause.)

> Example: 〜やらなきゃいけないこと  
>
>
> or: 〜やらなきゃならないこと

For clarity, in this case, I would suggest using something like the full
やらなきゃいけない〜 line.

By itself, the やらなきゃ seems to sound like: "gotta do" (something). I don't
think it has to do with the "unless" in this case, though the translated
nuance is 微妙 and I could be wrong.

If one was using something like 〜しないと it would be more like an _"unless (I do
something... it's gonna be bad!)"_ type of thing.

Generally, with modern Japanese (at least,) it's often easier just to use set
forms of phrases and clause combinations... so that people better know what
one is trying to say.
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No you cannot. `やらなきゃ時` and `やらなくちゃ時` are ungrammatical. `やらなきゃ` or `やらなくちゃ`
cannot be used as a relative clause (or attributively).
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2012-02-28T18:25:07.633
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Both やらなきゃ and やらなくちゃ are colloquial contractions of やらなければ "If does not do".

All of the above 3 can be short for やらなければいけない/ならない "have to do" when used
sentence-finally, but not when used in an appositive/relative clause.

> × やらなきゃこと  
>  × やらなきゃとき

There are cases where やらなきゃ and やらなくちゃ happen to be followed by a noun, but in
these cases they're conditional clauses, not appositive/relative clauses. I.e.
they're versions of やらなければ, but **not** やらなければいけない/ならない.

> やらなきゃ損だ If you don't do it, it's a loss.

As a final FYI, in slang/colloquial speak, you sometimes hear やらなければいけない/ならない
shortened to やらなきゃだ in clause-final positions, expecially when combined with
clause-ending or sentence-ending particles

> ? もう行かなきゃだよ You should go already  
>  ? もう行かなきゃだし、出るか！ We have to go so... let's get out of here!
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