〜たらいい(ですか)

About

〜たらいい(ですか) combines the たら conditional marker with いい ("good") and attaches to a question word to ask for advice.

A very common set phrase that uses 〜たらいい(ですか) is 「どうしたらいい」("What should I do?".)

〜たらいい(ですか) can combine with many different question words such as どう, 何なに, どこ, いつ, etc. The question word does not necessarily attach directly to たら (e.g. 「どこまで持もったらいいですか」"Where should I bring this?").

In casual speech, ですか can be dropped. It can also be substituted for でしょうか in even more polite scenarios.

Summary

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  〜たらいい(ですか) is used to ask for advice

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  〜たらいい(ですか) can be combined with question words such as だれ, どこ, いつ, どう, etc.