ことがある

Sometimes/Have Experienced

Level 3Sounds Like kotogaaru

V-た + ことがある: "I have done (experience)"
V-る + ことがある: "Sometimes happens (occurrence)"

How It Works

The structure ことがある is a versatile pattern used to talk about what has happened in your life or what happens occasionally.

1. Past Experience (V-た + ことがある)
When used with the plain past tense, it indicates that you have the experience of doing something at least once in your life. It is equivalent to "I have... before" in English.

  • It is used for general life experiences, not for things that happened recently.
  • The negative form 〜たことがない means "have never done." It is often paired with 一度も（いちども） to mean "never even once."
  • To ask if someone has ever done something, use 〜たことがありますか.

2. Occasional Occurrence (V-dictionary form / ない + ことがある)
When used with the non-past form, it indicates that something happens from time to time, but not regularly.

  • It is often paired with adverbs like たまに (occasionally) or ときどき (sometimes).
  • It can also be used with い-adjectives and な-adjectives (using な) to describe occasional states.
  • Nouns can also be used by adding の (e.g., 雨のことがある - there are times when it's rainy).

3. Variations
In casual speech, the particle が is often omitted (〜ことある). To emphasize that something also happens, you can replace が with も (〜こともある).

Examples (6)

  1. 日本へ行ったことがありますか。

    Have you ever been to Japan?

    Word by Word: Japan to went thing exists?

    Uses the past tense (行った) to ask about a life experience.

  2. 一度も納豆（なっとう）を食べたことがありません。

    I have never eaten natto even once.

    Word by Word: One-time even natto (obj) ate thing does not exist.

    The negative form 〜たことがない combined with 一度も (not even once) emphasizes a total lack of experience.

  3. たまに朝ごはんを食べないことがあります。

    There are times when I don't eat breakfast.

    Word by Word: Occasionally breakfast (obj) eat-not thing exists.

    Uses the negative plain form (食べない) to show an occasional occurrence.

  4. この辺りは、夜でも賑やかなことがあります。

    This area is sometimes lively even at night.

    Word by Word: This area (topic), night even lively thing exists.

    Shows how a な-adjective (賑やか) connects to the pattern using な.

  5. 仕事でミスをすることもあります。

    There are also times when I make mistakes at work.

    Word by Word: Work at mistake (obj) do thing also exists.

    Replacing が with も adds the nuance of 'also' or 'even'.

  6. 休みの日は雨のこともあります。

    There are times when it is rainy on my days off.

    Word by Word: Holiday (topic) rain (possessive) thing exists.

    Shows how a noun (雨) connects to the pattern using the particle の.

Common Mistakes

  • Using the dictionary form to describe a past experience.

    日本に行くことがあります。
    日本に行ったことがあります。

    Using the dictionary form (行く) means 'I sometimes go to Japan.' To say 'I have been to Japan,' you must use the past tense (行った).

  • Using the experience pattern for very recent or routine events.

    さっき、そのニュースを聞いたことがあります。
    さっき、そのニュースを聞きました。

    The 'experience' pattern is for historical life events. For something that just happened (like hearing news a moment ago), use the simple past tense.

How It Connects

Tap a pattern to see what it builds on and what it leads to.

ことがあるLevel 3Sometimes/Have Experienced

Learn This First

To understand 'ことがある', you first need to know the verb 'ある' (to exist) and how to modify nouns with verbs. Since the meaning changes based on the verb tense, you must also be familiar with the plain past (た form) for experiences and the dictionary form for occasional occurrences.

Words in This Pattern

ことがある