What is ことがある?
Ever want to say "I've been to Japan" or "I've eaten raw octopus"? That's what ことがある is for. It expresses past experience -- whether you've done something at least once before in your life. Think of it as the Japanese equivalent of "have you ever...?" or "I have (never) done..."
The pattern pairs the た form of a verb with ことがある. The verb goes into past tense, but ある itself stays in present tense. This trips people up at first, so keep it in mind: the た is doing the "past" work, and ある is just stating that the experience exists.
How to Form It
The structure is straightforward:
| Part | Role |
|---|---|
| Verb [た form] | The action you did |
| こと | Turns the verb into a noun ("the act of ~") |
| が | Subject marker |
| ある | Exists |
Polite and Casual Forms
| Form | Japanese | Meaning |
|---|---|---|
| Casual affirmative | 行ったことがある | Have been to |
| Polite affirmative | 行ったことがあります | Have been to (polite) |
| Casual negative | 行ったことがない | Have never been to |
| Polite negative | 行ったことがありません | Have never been to (polite) |
| Question | 行ったことがありますか？ | Have you ever been to...? |
Notice that you conjugate ある, not the main verb. The main verb is always locked in た form.
Asking About Experience
Questions with ことがある are a natural conversation starter. You'll hear these constantly:
- 日本に行ったことがありますか？
Have you ever been to Japan? - 寿司を食べたことがある？
Have you ever eaten sushi?
You can also add frequency. Unlike English "have you ever," ことがある works fine with counters like 一回 (once), 二回 (twice), 何回も (many times):
- 三回行ったことがある。
I've been there three times.
Watch Out: Don't Use with Specific Times
This is a common mistake. ことがある is about general life experience, not specific events. If you're talking about what happened yesterday or last Tuesday, just use ました or plain past tense.
- Wrong: 昨日寿司を食べたことがある。
- Right: 昨日寿司を食べた。 (I ate sushi yesterday.)
- Right: 寿司を食べたことがある。 (I've eaten sushi before.)
The difference: "I ate sushi yesterday" is a specific event. "I've eaten sushi before" is a life experience. ことがある is only for the second one.
Example Sentences
-
富士山に登ったことがあります。 (fujisan ni nobotta koto ga arimasu.)
I've climbed Mt. Fuji before. -
日本の映画を見たことがありますか？ (nihon no eiga wo mita koto ga arimasu ka?)
Have you ever watched a Japanese movie? -
納豆を食べたことがない。 (nattou wo tabeta koto ga nai.)
I've never eaten natto. -
一度だけ雪を見たことがある。 (ichido dake yuki wo mita koto ga aru.)
I've seen snow just once. -
あの店に行ったことがありますか？ (ano mise ni itta koto ga arimasu ka?)
Have you ever been to that shop? -
馬に乗ったことがありません。 (uma ni notta koto ga arimasen.)
I have never ridden a horse. -
何回も失敗したことがある。 (nankai mo shippai shita koto ga aru.)
I've failed many times before. -
外国に住んだことがありますか？ (gaikoku ni sunda koto ga arimasu ka?)
Have you ever lived abroad?