Tara ii and Ba ii: Asking What You Should Do

Why this is the first question to learn

Most beginner courses teach you to describe things long before they teach you to ask for guidance, which is the wrong way round for anyone actually living or travelling in Japan. You will spend far more time not knowing which window to queue at, which form to fill in, or what to say when you hand something over, than you will spend describing your hobbies. One pattern covers all of it, and it works even when your vocabulary for the situation is thin, because the person you ask supplies the words back to you.

It is also the safest question grammatically. You are not guessing at a modal verb, and you are not risking a command form aimed at yourself. You state a possible action as a condition and ask whether that condition is a good one. Because the sentence contains no demand, it stays polite in almost any setting, from a convenience store counter to a first day in a new office.

How the pattern is built

Break dō shitara ii desu ka into its two halves. Shitara is the conditional of suru, meaning if I do. Ii desu ka asks is it good. Put them together with a question word in front and you get, roughly, doing it how would be good. Japanese has no word here corresponding to should, so there is nothing extra to insert; the sense of should comes out of the condition plus the judgement.

That means the pattern accepts any question word at the front and any verb in the conditional. Choose the verb the answer will use, not the verb your first language would use. English says where should I go, and Japanese agrees with doko ni ikeba ii desu ka, but English says what should I write on this form while Japanese usually prefers koko ni nani o kakeba ii desu ka, keeping the location first and the verb last.

Making the ba form of any verb

For godan verbs, change the final -u sound of the dictionary form to -e and add -ba. For ichidan verbs, drop -ru and add -reba. Suru becomes sureba and kuru becomes kureba, and those two are the only irregulars you have to remember. The rule is mechanical enough that you can apply it to a verb you met five minutes ago.

Watch the two verbs that look alike in the -ru column. Okuru is godan, so it gives okureba, while deru is ichidan and gives dereba. If you are unsure which class a -ru verb belongs to, check its masu form: okurimasu points to godan, demasu points to ichidan. The conjugation guide on this blog sets out the classes in full.

Making the tara form of any verb

Tara is even easier, because it is built on a form you already have. Take the plain past, the ta form, and add -ra. That means every sound change you learned for the te form carries over untouched, so if you can say itte you can say ittara. There are no exceptions at all in this step, including for suru and kuru.

Ba or tara: which one to say

Both are correct in this pattern, so the choice is about texture rather than rules. Ba presents the action as an abstract condition, which is why it feels a shade tidier and turns up more often in written instructions and in offices. Tara presents it as a concrete step in sequence, if I do this and then, which is why it feels a shade softer and more everyday. In a shop or on the street either one will pass without comment.

Two habits are worth copying from native speech. First, dō shitara ii desu ka is much more common than dō sureba ii desu ka in ordinary conversation, so if you only drill one version of the suru question, drill that one. Second, in business Japanese the ba version dominates because it pairs naturally with the formal yoroshii deshō ka. Keeping both alive costs you nothing, since the same question can be rebuilt with either ending in half a second.

Softening the question with deshō ka

Deshō ka is the single most useful upgrade in this whole pattern. It turns a direct question into a tentative one, roughly I wonder whether, and it costs one syllable more than desu ka. Use it whenever you are interrupting someone, asking a stranger for their time, or speaking to anyone senior to you. Add yoroshii in place of ii and you have the register expected in a Japanese office or in front of a client.

A short preface helps as much as the ending does. Sumimasen, chotto ukagaitai n desu ga gives the listener time to turn toward you and signals that a question is coming, which is more considerate than launching straight into the sentence. You can also embed the whole question inside another sentence with ka, as in dō sureba ii ka oshiete itadakemasu ka, which is useful when the person is busy and you want to sound as though you know you are asking for a favour.

Asking for instructions at work

New employees in Japan are expected to ask, and asking early is read as conscientious rather than incompetent. The useful habit is to make your question specific: name the object, then the action, then the pattern. Kono shiryō wa dare ni okureba yoroshii deshō ka tells your colleague exactly what you need, while a bare dō shitara ii desu ka makes them work out what you are stuck on.

Notice the last line. A guidance question is only finished when you close it, and wakarimashita followed by a thank you is the standard close. If the answer went past you, do not close it falsely: say mōshiwake arimasen, mō ichido oshiete itadakemasu ka and let them repeat it.

Asking as a traveller or a new resident

Outside work the same pattern carries you through counters, clinics, city offices and rubbish rules. Keep the noun first so the listener knows the topic before the grammar arrives, and be ready for the answer to come back as a te kudasai instruction rather than as a full sentence. The direction and station guides on this blog cover the vocabulary; the pattern here is what gets you to the point of needing it.

Answering: giving advice back

Sooner or later someone asks you the same question, and the answering side uses the same conditional. Tara ii desu yo offers one workable option without insisting: hayame ni yoyaku shitara ii desu yo. Tara dō desu ka turns it into a gentle suggestion, literally how would it be if you did. Both are light, and both leave the decision with the listener.

Ta hō ga ii desu is stronger. It compares your suggestion with the alternative and says yours is better, so it edges toward advice you expect to be taken, which is why it fits health and safety more than preferences. Its negative partner is not ta but nai: byōin ni itta hō ga ii desu, kyō wa muri shinai hō ga ii desu. Learners often build the negative as ikanakatta hō ga ii, which is wrong; the negative side keeps the plain nai form.

For softer advice still, use to ii desu yo, or step back from advice altogether with watashi dattara, which reports what you personally would do and leaves the listener free to do otherwise. In a workplace, that last move is often the most comfortable one when the person asking outranks you.

Mistakes that change the meaning

The first trap is dō shimasu ka. It looks like the same question but it points the other way: it asks what the listener will do, or how they would like something done, so a shop assistant may use it with you while you should almost never use it with them. If you want guidance, the conditional has to be there.

The second trap is confusing this pattern with permission. Tara ii desu ka asks whether an action is the right one to take, while te mo ii desu ka asks whether you are allowed to take it. Suwattara ii desu ka means where or whether sitting is the sensible move; suwatte mo ii desu ka asks may I sit down. In a waiting room the second is the one you want.

The third is over-formality. Yoroshii deshō ka in a convenience store sounds stiff, and a plain dō sureba ii desu ka to a client sounds abrupt. Keep three settings in your head: casual dō shitara ii kana with friends, standard dō shitara ii desu ka almost everywhere, and formal dō sureba yoroshii deshō ka at work.

Drills that make the pattern arrive on time

Start with pure conjugation. Take ten verbs you already use and run each through three beats out loud: dasu, daseba, itsu daseba ii desu ka. Then run the tara branch: dasu, dashita, dashitara. Ten verbs both ways takes about four minutes and covers the entire grammatical content of this post, which is why it is worth doing before any conversation practice.

Next, drill the question word rather than the verb. Fix one verb, iku, and cycle every question word through it: doko ni ikeba, itsu ikeba, dare to ikeba, dō yatte ikeba, nan-ji ni ikeba. This is the drill that stops you freezing halfway through a real question because the wrong word arrived first.

Finally, practise the whole exchange, not just the question. Say the question, imagine a te kudasai answer, then close with wakarimashita or with a request for a repeat. Guidance questions fail in real life not at the asking stage but at the listening stage, and only rehearsing all three beats fixes that.

• Write five real problems from your week and convert each into a ba question and a tara question.
• Record yourself asking one question at all three politeness levels and check the ending, not the vocabulary.
• Answer your own questions twice: once with tara ii desu yo and once with ta hō ga ii desu.
• Collect every te kudasai reply you hear this week; those are the answers your questions will trigger.
• Say mō ichido onegaishimasu out loud until it is faster than your instinct to nod and pretend.