〜たらいいですか tara ii desu ka
〜たらいいですか（tara ii desu ka）means “what/how should I ...?”. Used with a question word (どう, なに, どこ…) to ask for advice or instructions: 'What/how/where should I . Formation: 疑問詞（どう・どこ・なに 等）+ V-た + らいいですか
what/how should I ...?
N4Formation
疑問詞（どう・どこ・なに 等）+ V-た + らいいですか
Explanation
Used with a question word (どう, なに, どこ…) to ask for advice or instructions: 'What/how/where should I ...?'. Literally 'would it be good if I did ...?'. A polite, common way to ask someone what the best course of action is.
Examples
Note
More casual: 〜たらいい(の)？; more formal in writing: 〜ばよいでしょうか. Without a question word, 〜たらいいです (no ka) instead gives a suggestion: 'you should ...'.
FAQ
〜たらいいですか — what does it mean and how is it used?
what/how should I ...?. Used with a question word (どう, なに, どこ…) to ask for advice or instructions: 'What/how/where should I ...?'. Literally 'would it be good if I did ...?'. A polite, common way to ask someone what the best course of action is.
〜たらいいですか — how do you form it?
疑問詞（どう・どこ・なに 等）+ V-た + らいいですか
〜たらいいですか — any usage notes?
More casual: 〜たらいい(の)？; more formal in writing: 〜ばよいでしょうか. Without a question word, 〜たらいいです (no ka) instead gives a suggestion: 'you should ...'.