Tara Conditional in Japanese

Overview

The たら conditional is the most versatile and beginner-friendly conditional form in Japanese. Formed by adding ら to the past tense (た-form) of a verb, adjective, or noun phrase, it expresses "if" or "when" with an emphasis on sequential events: when/after X happens, then Y. At the CEFR A2 level, this is the first conditional pattern you should master, as it covers the widest range of everyday situations.

The たら conditional can be used for hypothetical situations ("If it rains, I'll stay home"), temporal sequences ("When I finish, I'll call you"), counterfactual wishes ("If I were rich..."), and even discovered results ("When I got home, my friend was there"). This flexibility makes it the safest choice when you are unsure which conditional to use — if in doubt, use たら.

Unlike some of the other Japanese conditionals (と, ば, なら), たら places no restrictions on what can follow in the result clause. You can use it with commands, requests, invitations, volitional expressions, and statements of intent — making it the most unrestricted conditional form in the language.

Formation / How It Works

Basic Rule: た-form + ら

Type	た-form	たら form	Meaning
Verb (godan)	行った	行ったら	if/when [someone] goes
Verb (ichidan)	食べた	食べたら	if/when [someone] eats
Verb (irregular)	した	したら	if/when [someone] does
Verb (irregular)	来た	来たら (きたら)	if/when [someone] comes
い-adjective	安かった	安かったら	if it's cheap
な-adjective	静かだった	静かだったら	if it's quiet
Noun + copula	雨だった	雨だったら	if it's rain

Negative たら

Type	Negative Past	Negative たら	Meaning
Verb	行かなかった	行かなかったら	if [someone] doesn't go
い-adjective	安くなかった	安くなかったら	if it's not cheap
な-adjective	静かじゃなかった	静かじゃなかったら	if it's not quiet

Usage Types

Type	Description	Example
Hypothetical	If X happens (uncertain)	雨が降ったら、家にいます。
Temporal	When X happens (expected)	終わったら教えてください。
Counterfactual	If X were true (but isn't)	お金があったら、旅行したい。
Discovery	When X happened, found Y	家に帰ったら、母がいました。

Examples in Context

Japanese	English	Note
雨が降ったら、家にいます。	If it rains, I'll stay home.	Hypothetical condition
安かったら買います。	If it's cheap, I'll buy it.	い-adjective condition
日本に行ったら、富士山に登りたいです。	If I go to Japan, I want to climb Mt. Fuji.	Hypothetical + desire
終わったら教えてください。	When you're done, please let me know.	Temporal + request
暇だったら、映画を見ませんか。	If you're free, would you like to watch a movie?	Invitation
家に帰ったら、猫が寝ていました。	When I got home, the cat was sleeping.	Discovery (past)
お金があったら、新しい車を買いたいです。	If I had money, I'd want to buy a new car.	Counterfactual
分からなかったら、聞いてください。	If you don't understand, please ask.	Negative condition + request
もっと早く起きたら、朝ご飯が食べられます。	If you wake up earlier, you can eat breakfast.	Advice
静かだったら、勉強できます。	If it's quiet, I can study.	な-adjective condition
明日天気がよかったら、公園に行きましょう。	If the weather is good tomorrow, let's go to the park.	Suggestion
駅に着いたら、電話してね。	When you arrive at the station, call me.	Casual request

Common Mistakes

Wrong: 雨が降るたら Right: 雨が降ったら Why: たら attaches to the た-form (past tense), not the dictionary form. You must first conjugate the verb to its past tense, then add ら.

Wrong: 安いだったら Right: 安かったら Why: For い-adjectives, use the past tense form (安かった) + ら. Do not insert だ between an い-adjective and たら.

Wrong: 静かだたら Right: 静かだったら Why: For な-adjectives and nouns, the past copula is だった (not だた), so the conditional is だったら. Don't forget the small っ.

Wrong: 昨日雨が降ったら、家にいました。(intending "Because it rained yesterday...") Right: 昨日雨が降ったので、家にいました。 Why: たら is a conditional ("if/when"), not a causal connector ("because"). For giving reasons about past events, use ので or から instead.

Usage Notes

The たら conditional is appropriate in all registers — casual, polite, and formal. In polite speech, the result clause uses ます/です forms; the たら form itself does not change for politeness.

Among the four main Japanese conditionals (たら, と, ば, なら), たら is the most flexible. It is the only one that freely allows commands, requests, and volitional forms in the result clause. When you are speaking and need a conditional quickly, たら is almost always a safe choice.

The "discovery" use of たら (家に帰ったら、母がいました) is unique to this conditional. It describes something you encountered or realized upon completing an action. The result clause is always in past tense for this use.

Practice Tips

• Convert your daily "if" thoughts to Japanese. Throughout the day, notice when you think "if..." or "when..." and try forming the たら sentence: "If the coffee shop is open..." → コーヒーショップが開いていたら...
• Master the た-form first. Since たら is simply た-form + ら, any weakness in forming the past tense will carry over. Drill your た-form conjugations until they are automatic, and たら comes for free.
• Practice all four usage types. Write one sentence for each type (hypothetical, temporal, counterfactual, discovery) using the same verb. This helps you see the flexibility of the pattern.

Related Concepts

• た-Form (Past Plain)
• Ba Conditional
• Nara Conditional