Overview of Four Conditionals
Japanese has four main conditional forms, each with specific uses and restrictions. Understanding when to use each is key to natural Japanese.
と - Natural consequence, habitual
ば - General condition, requirement
たら - Most versatile, hypothetical
なら - Context-based, advice
Side-by-Side Comparison
Same sentence, different conditionals
と: 春になると、花が咲く
"When spring comes, flowers bloom" (every year, natural)
ば: 春になれば、花が咲く
"If spring comes, flowers will bloom" (general statement)
たら: 春になったら、花見に行こう
"When spring comes, let's go flower viewing" (specific plan)
なら: 春なら、桜が綺麗だよ
"If it's spring, cherry blossoms are beautiful" (advice/info)
Detailed Comparison Table
| Feature | と | ば | たら | なら |
|---|---|---|---|---|
| Main use | Natural consequence | General condition | Hypothetical/sequential | Contextual |
| Commands after | ✗ No | ✓ Yes | ✓ Yes | ✓ Yes |
| Volitional after | ✗ No | ✓ Yes | ✓ Yes | ✓ Yes |
| Past result | ✓ Yes | ✗ No | ✓ Yes | Sometimes |
| Discovery | ✓ Yes | ✗ No | ✓ Yes | ✗ No |
| Formality | Neutral | Formal | Casual | Casual |
| Versatility | Limited | Moderate | High | Moderate |
と (Natural Consequence)
When to use
✓ Natural/automatic results
✓ Habitual actions
✓ Scientific facts
✓ Directions
✓ General truths
このボタンを押すと、開く
"When you press this button, it opens"
When NOT to use
✗ With commands/requests
✗ With volitional (~よう)
✗ Hypothetical one-time events
✗ Based on given context
Wrong: 暇だと、手伝って ❌
Right: 暇なら、手伝って ✓
ば (General Condition)
When to use
✓ General conditions
✓ Requirements
✓ Hypothetical (formal)
✓ Prerequisites
✓ Conditional abilities
勉強すれば、合格できる
"If you study, you can pass"
When NOT to use
✗ With past tense results
✗ For discoveries
✗ Very casual conversation
Wrong: 行けば、いなかった ❌
Right: 行ったら、いなかった ✓
たら (Hypothetical/Sequential)
When to use
✓ Hypothetical situations
✓ Sequential actions (when/after)
✓ Discoveries
✓ Specific future plans
✓ Most situations!
家に着いたら、電話して
"When you get home, call me"
When NOT to use
Honestly, たら works almost everywhere!
It's the safest choice when unsure.
Only slight awkwardness in:
⚠️ Very formal writing (use ば)
⚠️ Scientific facts (use と)
なら (Contextual)
When to use
✓ Based on given information
✓ Giving advice
✓ Topic-oriented statements
✓ "If that's the case..."
✓ Responding to statements
東京なら、知ってる
"If it's Tokyo, I know about it"
When NOT to use
✗ Hypothetical future (unclear)
✗ Natural consequences
✗ Discoveries
✗ Scientific facts
Unclear: 明日雨なら、中止 ⚠️
Clear: 明日雨だったら、中止 ✓
Commands and Requests
Can you use commands after?
と: ❌
春になると、花見に行こう (unnatural)
ば: ✓
時間があれば、手伝って
"If you have time, help me"
たら: ✓
終わったら、教えて
"When you're done, let me know"
なら: ✓
暇なら、来てね
"If you're free, come over"
Past Tense Results
Can you describe past discoveries?
と: ✓
家に帰ると、猫が寝ていた
"When I got home, the cat was sleeping"
ば: ❌
家に帰れば、猫が寝ていた (wrong)
たら: ✓
家に帰ったら、猫が寝ていた
"When I got home, the cat was sleeping"
なら: ❌
家に帰るなら、猫が寝ていた (wrong)
Making Plans
Which sounds most natural?
Less natural: 明日晴れると、行く
More natural: 明日晴れれば、行く
Most natural: 明日晴れたら、行こう ✓✓✓
Context-based: 明日晴れなら、行けるよ
For future plans → Use たら!
Giving Directions
Which is best?
Best: まっすぐ行くと、駅がある ✓✓✓
"When you go straight, there's a station"
OK: まっすぐ行けば、駅がある
OK: まっすぐ行ったら、駅がある
Odd: まっすぐ行くなら、駅がある
For directions → Use と!
Offering Advice
Which sounds natural?
Odd: 痩せたいと、運動して
Wrong: 痩せたければ、運動して
OK: 痩せたかったら、運動して
Best: 痩せたいなら、運動したほうがいい ✓✓✓
For advice → Use なら!
Expressing Requirements
Which emphasizes condition?
Neutral: 会員になると、安くなる
Best: 会員になれば、安くなる ✓✓✓
OK: 会員になったら、安くなる
Topic: 会員なら、安い
For requirements → Use ば!
Habitual Actions
Which for habits?
Best: 朝起きると、コーヒーを飲む ✓✓✓
"When I wake up, I drink coffee"
OK: 朝起きれば、コーヒーを飲む
OK: 朝起きたら、コーヒーを飲む
Odd: 朝起きるなら、コーヒーを飲む
For habits → Use と!
Multiple Conditionals Accepted
Many situations accept multiple forms
時間があると、散歩する (habitual)
時間があれば、散歩します (general)
時間があったら、散歩しよう (specific plan)
時間があるなら、散歩しない？ (suggestion)
All grammatically correct!
Nuance differs slightly
Formality Levels
From casual to formal
Most casual:
暇だったら、遊ぼう (たら)
Casual-neutral:
暇なら、遊ぼう (なら)
暇だと、暇だ (と) - stating fact
Formal:
お時間があれば、ご連絡ください (ば)
Decision Flowchart
1. Is it automatic/natural/habitual?
→ YES: Use と
→ NO: Go to 2
2. Is it a general condition/requirement?
→ YES: Use ば
→ NO: Go to 3
3. Is it based on given context/advice?
→ YES: Use なら
→ NO: Go to 4
4. When in doubt or for hypothetical
→ Use たら (safest choice!)
Common Mistakes to Avoid
Mistake 1: Using と with commands
Wrong: 時間があると、来て ❌
Right: 時間があったら、来て ✓
Right: 時間があれば、来て ✓
Right: 時間があるなら、来て ✓
Mistake 2: Using ば with past
Wrong: ドアを開ければ、誰もいなかった ❌
Right: ドアを開けたら、誰もいなかった ✓
Right: ドアを開けると、誰もいなかった ✓
Mistake 3: Using なら for hypothetical
Unclear: 明日雨なら、中止 ⚠️
Clear: 明日雨だったら、中止 ✓
Clear: 明日雨なら中止だよ (if told it will rain) ✓
Real-World Examples
Example 1: Weather and plans
と: 雨が降ると、中止になる (always/rule)
ば: 雨が降れば、中止です (general condition)
たら: 雨が降ったら、中止だ (specific situation) ✓ Most common
なら: 雨なら、中止だよね (based on forecast)
Example 2: Asking for help
と: ❌ (can't use with requests)
ば: 時間があれば、手伝って ✓
たら: 時間があったら、手伝って ✓ Most common
なら: 時間があるなら、手伝って ✓
Example 3: Giving directions
と: 右に曲がると、駅がある ✓ Most natural
ば: 右に曲がれば、駅がある ✓
たら: 右に曲がったら、駅がある ✓
なら: 右に曲がるなら、駅がある (odd)
When たら is Best
たら works in most situations
✓ Future plans
✓ Hypothetical
✓ Sequential actions
✓ Discoveries
✓ Casual conversation
✓ Commands/requests
✓ With volitional
If unsure → Use たら!
When Each is Preferred
Quick reference
Natural facts: と
"When you heat water, it boils"
Requirements: ば
"If you're a member, you get a discount"
Plans/hypothetical: たら
"If it's sunny tomorrow, let's go"
Advice/context: なら
"If you're going to Tokyo, spring is good"
Summary: Key Differences
**と**
✓ Natural, automatic, habitual
✗ No commands, no volitional
Example: 春になると咲く
**ば**
✓ General condition, requirement
✗ No past results
Example: 頑張れば成功する
**たら**
✓ Most versatile! Everything works
✗ (Almost no restrictions)
Example: 終わったら教えて
**なら**
✓ Context-based, advice
✗ Not for natural facts
Example: 東京なら知ってる
Practice: Choose the Best
1. "When spring comes, flowers bloom"
Best: と ✓
2. "If you study, you can pass"
Best: ば ✓
3. "If it rains tomorrow, it's cancelled"
Best: たら ✓
4. "If you're going to Japan, spring is good"
Best: なら ✓
5. "When you get home, call me"
Best: たら ✓
6. "When you press this, it opens"
Best: と ✓
Related Grammar Points
- と conditional - Natural consequence
- ば conditional - General condition
- たら conditional - Hypothetical/sequential
- なら conditional - Contextual
- Conditionals overview - All forms
- Conditional mastery - Advanced usage