ことがある
Have the experience of ~ / Have done ~ before
Expresses that someone has experienced something at least once in the past.
N3
Meaning
Have the experience of ~ / Have done ~ before
Expresses that someone has experienced something at least once in the past.
Formation
Verb（た-form）+ ことがある
Explanation
「〜たことがある」 is used to express past experience.
Key nuance:
The exact time is not important.
The focus is on whether the experience exists.
It implies “at least once.”
It does NOT indicate how many times.
This grammar answers the question:
👉 “Have you ever ~ ?”
It is commonly used in conversations about:
Travel
Work experience
Personal history
Life events
Important Structural Rule
Only た-form can be used.
✔ 行ったことがある
✖ 行くことがある (this means “sometimes go”)
This structural difference is extremely important for JLPT.