Some Japanese particles look identical but serve completely different purposes.「と」is a perfect example: after a noun, it's a case particle; after a non-noun, it becomes a conjunction. Once you grasp this distinction, all of「と」's uses become clear.
Case Particle「と」: After Nouns
When「と」follows a noun, it functions as a case particle with two main uses.
1. Listing: A and B
The most basic use — connecting two or more nouns:
Note:「と」creates an exhaustive list (all items mentioned), while「や」creates a non-exhaustive list (just examples).
2. Companion: Together with someone
Indicates doing something with another person:
Conjunction「と」: After Non-nouns
When「と」follows a verb, adjective, or clause, it becomes a conjunction expressing conditions or results.
3. Condition / Natural Result
Expresses "when A happens, B naturally follows":
| Example | Meaning |
|---|---|
| 春になると、桜が咲く。 | When spring comes, the cherry blossoms bloom. |
| このボタンを押すと、水が出る。 | When you press this button, water comes out. |
Conjunctive「と」describes objective, inevitable cause-and-effect. It cannot be used for personal requests or intentions.
4. Quotation
「と」can also quote speech or thoughts:
| Example | Meaning |
|---|---|
| 選挙演説で、みんないいことを言っていると思わせる。 | Campaign speeches make you think everyone is saying good things. |
| 明日は雨だと思う。 | I think it will rain tomorrow. |
Quick Guide: Case Particle or Conjunction?
The method is simple:
| Criterion | Case Particle | Conjunction |
|---|---|---|
| What comes before? | Noun | Verb / Adjective / Clause |
| Meaning | "and" (listing / companion) | Condition / result / quotation |
| Example | 友達と遊ぶ | 押すと開く |
Bonus: ことは…が for Contrastive Emphasis
At the N3 level, you'll often encounter ことは + affirmation…が + contrast, meaning "it's true that…, but…":
| Example | Meaning |
|---|---|
| 覚えていることは覚えているが、場所が思い出せない。 | I do remember, but I can't recall the place. |
| 食べたことは食べたが、おいしくなかった。 | I did eat it, but it wasn't good. |
The key: ことは nominalizes and emphasizes the first clause, then が introduces the contrast.
Summary
- 「と」after a noun is a case particle meaning "and" (listing or companion)
- 「と」after a non-noun is a conjunction expressing conditions, natural results, or quotations
- To identify which: check whether a noun or non-noun precedes「と」
- ことは…が is a common contrastive emphasis pattern
Practice
1. What role does「と」play in each sentence?
- a. 田中さんと映画を見た。
- b. 暗くなると、星が見える。
Show answer
- a. Case particle (companion): I watched a movie with Tanaka.
- b. Conjunction (natural result): When it gets dark, you can see the stars.
2. Rewrite using ことは…が: "確かに読んだ。でも内容を忘れた。"
Show answer
読んだことは読んだが、内容を忘れた。 → I did read it, but I forgot the content.
3. Can「と」be used to make requests, like "press the button and please open the door"?
Show answer
No. Conjunctive「と」can only describe objective, naturally occurring results. It cannot express requests, commands, or intentions. For requests, use「たら」or「ば」instead.