たことがある
- 1Have done something at some point in the past, presented as part of one's experience.Ex. 1
- 2Used in questions to ask whether someone has ever done something.Ex. 2
- 3In the negative form たことがない, have never done something.
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Neutral pattern used in everyday conversation and writing to talk about experiences, often with 一度 or 何度も. The polite form ことがあります is common when speaking to others. Unlike ことがある after the dictionary form, which means something happens occasionally, this pattern refers to having had an experience in the past.
Do not use it to report one specific recent occasion, such as eating breakfast this morning; ordinary actions are fine when framed as having ever done them.
Learners sometimes attach ことがある to the dictionary form, which changes the meaning to 'sometimes does' rather than 'has done'.
Note that 'have never done' is たことがない; 行かなかったことがある instead means there was an occasion when one did not go.
- ことがあるN3「ことがある」 has a broader range: with the verb た form it is this pattern and expresses experience, but with the dictionary form, ない form, adjectives, or nouns it means 'sometimes...' and describes occasional occurrences, not experiences.
- たものだN5「たものだ」 recalls the past with nostalgia or emotion (things one used to do or memorable experiences), and can also attach to adjectives and nouns; 「たことがある」 merely states whether one has had an experience, without emotional coloring, so the two are generally not interchangeable.
- 〜たきりN3「〜たきり」 also attaches to the verb た form, but it does not talk about whether one has had an experience; it means that after doing something, nothing followed and things have stayed that way ever since. The second clause is usually negative and often carries a tone of surprise or regret, so the two are not interchangeable.
- たばかりN4「たばかり」 also attaches to the verb た form, but it indicates that an action was just completed or that one has just entered a new state ('just...'), focusing on how recent it is. 「たことがある」 concerns whether one has had an experience and is not used for things that just happened, so the two are not interchangeable.
ことがある after the dictionary form means something occasionally happens, and たものだ recalls past habits nostalgically, whereas たことがある marks having had an experience at least once. 〜たきり means something was done once and nothing followed, and たばかり means something was just done, so neither expresses general experience.
