YOU SAID:

what I just want to react to videos

INTO JAPANESE

動画に反応したいこと

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What you want to react to the video

INTO JAPANESE

動画でリアクションしたいこと

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What do you want to react to in the video?

INTO JAPANESE

動画で何に反応したいですか？

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What do you want your video to react to?

INTO JAPANESE

動画に何を反応させたいですか？

BACK INTO ENGLISH

What do you want your video to react to?