たらいいですか

The pattern たらいいですか is used to ask for advice, instructions, or guidance from the listener. It combines the conditional たら form with いい (good) and the question marker か, literally meaning "if I do ~, would it be good?" – or more naturally, "What should I do?" / "How should I...?"

This pattern is especially common with question words like どう (how), なん何 (what), どこ (where), いつ (when), and だれ誰 (who), making it a flexible way to ask for specific instructions.

Asking "What should I do?"

The most common use is with どう to ask for general advice:

Asking about specific actions

Combined with other question words, it targets specific information:

Casual form: たらいい？

In informal speech, ですか is dropped:

Nuance

This pattern positions the speaker as seeking guidance from the listener. It implies that the listener has more knowledge or authority on the matter. Compare this with 〜～ほうがいい, which is used to give advice rather than ask for it.