GrammarJLPT N5
→ have done before
Have done (something) before
JLPT N5Fixed phraseNeutral
～たことがある is used to express that one has had the experience of doing something at some point in the past. It does not specify when or how many times the action occurred; it simply states that the experience exists. The grammar point combines the past tense (た-form) of a verb with こと (which nominalizes the verb, turning it into 'the act of doing') and ある (which means 'to exist'). So literally, the structure means 'the experience of having done ~ exists.' This is distinct from the simple past tense ～た, which describes a specific past event, whereas ～たことがある focuses on whether the experience has ever happened. It should also not be confused with ～ことがある attached to the dictionary form of a verb, which means 'it sometimes happens that ~.' The negative form, ～たことがない, means 'have never done ~.' This expression is one of the most fundamental ways to talk about life experiences in Japanese and is appropriate in both casual and polite contexts.
Examples
Example #1
日本に行ったことがあります。
This sentence uses ～たことがある in its polite form (～たことがあります) to express the speaker's past experience of having visited Japan. The focus is not on when the trip happened or how many times, but simply on the fact that the speaker has had this experience at least once. The verb 行く is conjugated to its た-form 行った, and then ことがあります is attached to complete the expression.I have been to Japan before.
Structures
- Verb (た-form)
- Verb (た-form) + ことがある
Common mistakes
A very common mistake is using the dictionary form instead of the た-form, saying something like 行くことがある instead of 行ったことがある. These two expressions have entirely different meanings: 行くことがある means 'it sometimes happens that I go,' while 行ったことがある means 'I have been there before.' Another frequent error is confusing ～たことがある with the simple past tense ～た. For example, 日本に行った means 'I went to Japan' (referring to a specific event), while 日本に行ったことがある means 'I have been to Japan' (referring to the general experience). Learners also sometimes drop the particle が and say たことある, which is acceptable in very casual speech but should be avoided in polite or written contexts. Finally, be careful not to use this pattern for recent or ongoing actions; ～たことがある is specifically about whether an experience has ever occurred, not about current states or habits.
Related
～たことがない～ことがある (sometimes)～たばかり～ている～た (past tense)