What is the difference between ことがある (koto-ga-aru) and たことがある (ta-koto-ga-aru) in Japanese?

ことがある (koto-ga-aru) vs たことがある (ta-koto-ga-aru)

What's the Difference?

Use ことがある for general or recurring actions, and たことがある for completed experiences. The key difference lies in the tense and aspect of the action.

Aspect	ことがある (koto-ga-aru)	たことがある (ta-koto-ga-aru)
JLPT	N4	N4
Formality	neutral	neutral
Tense	Refers to the present or general timeframe	Refers to a past experience
Aspect	Indicates a recurring or general action	Indicates a completed action
Usage	Often used for habits or routines	Often used for one-time experiences or achievements

JLPT: N4 | Formality: neutral

JLPT: N4 | Formality: neutral

私は時々日本語の勉強をする

watashi wa tokidoki nihongo no benkyou o suru

I sometimes study Japanese

彼はことがある友達と電話をする

kare wa koto ga aru tomodachi to denwa o suru

He sometimes talks to his friends on the phone

彼女はことがある海で泳ぐ

kanojo wa koto ga aru umi de oyu

She sometimes swims in the sea

私は日本に旅行したことがある

watashi wa nihon ni ryokou shita koto ga aru

I have traveled to Japan

彼はスキューバダイビングを試したことがある

kare wa suyuba daibingu o tameshita koto ga aru

He has tried scuba diving

彼女はパリで暮らしたことがある

kanojo wa pari de kurashita koto ga aru

She has lived in Paris

⚠ Using ことがある for completed experiences, which can change the meaning of the sentence
⚠ Using たことがある for general or recurring actions, which can make the sentence sound unnatural
⚠ Not recognizing the difference in tense and aspect between the two phrases

💡 Remember that ことがある is like 'sometimes' and たことがある is like 'have done', this will help you to use them correctly

Get the complete grammar comparison guide as a downloadable PDF.