JLPT N46 min readUpdated May 17, 2026Grammar pattern

たらいいですかtara ii desu ka“what should I do”

Use たらいいですか when you want to express what should I do in a Japanese sentence.

Meaning
what should I do
Pattern
たらいいですか
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JLPT grammar
JLPT
N4

たらいいですか means what should I do. It is a JLPT N4 Japanese grammar pattern used to express this idea in natural Japanese.

This English meaning is written independently from the source list so it answers the learner question directly: what does たらいいですか mean and when should you use it?

たらいいですか is the natural way to ask “what should I do?” in Japanese by attaching to the た-form of any verb.

What does たらいいですか mean?

Use たらいいですか when you want to express what should I do in a Japanese sentence.

Natural translations include:

  • what should I do
  • to express “what should I do” naturally
  • the closest natural English meaning in context

How to form たらいいですか

Question word + verb (た-form) + らいいですか

Examples of the pattern:

  • どこで買(か)ったらいいですか
  • 何(なに)を持(も)って行(い)ったらいいですか
  • 誰(だれ)に聞(き)いたらいいですか

Related form: ばいいですか

!
The verb must be in the た-form before adding ら. Do not use the dictionary form or the て-form here.

When is たらいいですか used?

Use たらいいですか in situations like:

  • reading or writing JLPT N4-level sentences
  • making a sentence more precise than a basic N5 pattern
  • recognizing natural grammar in conversation or short passages

Tone and register:

  • usually neutral unless the pattern itself is casual, humble, honorific, or written
  • common in JLPT N4 grammar study and everyday examples

たらいいですか example sentences

どこで切符(きっぷ)を買(か)ったらいいですか。
Where should I buy a ticket?
N4 question
何(なに)を持(も)って行(い)ったらいいですか。
What should I bring?
N4 question
誰(だれ)に聞(き)いたらいいですか。
Who should I ask?
N4 question
この漢字(かんじ)はどう読(よ)んだらいいですか。
How should I read this kanji?
N4 question
駅(えき)までどう行ったらいいですか。
How should I get to the station?
N4 question

After reading each sentence, notice how the question word (where, what, who, how) changes the specific meaning while the grammar pattern stays the same.

Nuance of たらいいですか

The key nuance is what should I do in context, not a word-for-word English replacement.

This matters because たらいいですか often changes the relationship between actions, people, time, or evidence in the sentence. Read the whole sentence before choosing the English translation.

たらいいですか vs ばいいですか

Both patterns can appear in related sentences, but they do different jobs.

たらいいですか
Focuses on what should I do with a softer, more exploratory tone.
どこで切符(きっぷ)を買(か)ったらいいですか。
Where should I buy a ticket?
vs
ばいいですか
A related pattern that may change the tone, evidence, direction, or relationship in the sentence.
何(なに)をすればいいですか。
What should I do? (different nuance and verb form)

If both translations seem possible, check the verb form. たらいいですか requires the た-form, while ばいいですか requires the ば-form.

Common mistakes with たらいいですか

❌
Translating たらいいですか as a fixed phrase without checking the surrounding context.
✅
Read the whole sentence first; the question word determines whether it means where, what, or how.
Copying a dictionary gloss without checking the sentence context leads to awkward translations.
❌
どこで切符(きっぷ)を買(か)るらいいですか。
✅
どこで切符(きっぷ)を買(か)ったらいいですか。
Using the plain form instead of the た-form before らいいですか.
❌
Confusing たらいいですか with ばいいですか only because the English sounds similar.
✅
たらいいですか uses the た-form + ら; ばいいですか uses the ば-form. Choose based on the required conjugation.
The two patterns attach to different verb forms, so the grammar structure itself tells you which one to use.

Is たらいいですか on the JLPT?

N4

たらいいですか is a core JLPT N4 pattern.

✓ Recognize it in reading and listening
✓ Understand how the question word shifts the meaning
✓ Use it in simple original sentences

Practice questions for たらいいですか

1
Write one short sentence using the basic structure.
production
2
Replace the subject, time, or object and keep the same grammar point.
variation
3
Compare your sentence with the related pattern ばいいですか and note the verb-form difference.
comparison

Learning path for たらいいですか

1
Memorize the formation: question word + verb た-form + らいいですか.
2
Review the level of pressure in たらいいですか: necessity, prohibition, command, request, or advice.
3
Compare it with ばいいですか so you know which verb form each pattern requires.
4
Write one sentence that uses たらいいですか in its most literal meaning, one that changes the subject or time expression, and one that contrasts it with an obligation pattern.

Learn たらいいですか with Hane

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FAQ about たらいいですか

What does たらいいですか (tara ii desu ka) mean in Japanese?

たらいいですか (tara ii desu ka) means “what should I do”. It is JLPT N4 grammar. Use たらいいですか when you want to express what should I do in a Japanese sentence.

How do you form たらいいですか (tara ii desu ka)?

Question word + verb (た-form) + らいいですか

What is the difference between たらいいですか and ばいいですか?

たらいいですか: Focuses on what should I do. ばいいですか: A related pattern that may change the tone, evidence, direction, or relationship in the sentence.

What is an example sentence with たらいいですか (tara ii desu ka)?

どこで切符を買ったらいいですか。 — Where should I buy a ticket?

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