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I know/think that ~ばいい can be used, ex.

> How am I supposed to deal with this?
>
> どう扱えばいい？

But is there another way to say it? Maybe something involving はず?
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2015-10-01T02:47:59.060
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2015-10-01T20:22:01.830
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question
grammar syntax
How do you say "How am I supposed to X"?
The closest phrase to "be supposed to do" is …することになっている, and you can say
どう扱うことになっている(のだろうか)？. However, if the matter doesn't have enough
reproducibility, it's not necessarily a useful expression. In that sense,
どう扱えばいい or どう扱うべき are reasonable after all.
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2015-10-01T13:07:56.027
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Well, I still don't really understand the exact situation you're imagining,
but maybe something like

> いったいどうしたらいいの？！もうわけわっかんないよ…

is desperate enough for you? (At least, I can imagine someone crying and
saying it...)
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2015-10-01T19:02:52.257
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2015-10-01T19:02:52.257
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Your example (どう扱えばいい？) is about as close to "How am I supposed to deal with
this?" as you can get.

Here are some related phrases:

> What should I do?  
>  どうすればいい？
>
> What is the best way to (do something)?  
>  （何かする）のに一番いい方法は何でしょうか。
>
> There's no way I could do that.  
>  できるはずはない。
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2015-10-01T20:22:01.830
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2015-10-01T20:22:01.830
2020-06-17T08:18:27.500
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