YOU SAID:

i dont know that to say

INTO JAPANESE

私はそれを言うことを知らない

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I don't know to say that

INTO JAPANESE

言うのかわからない

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I don't know what to say

INTO JAPANESE

- イエスと言えば

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I don't know what to say.

INTO JAPANESE

- イエスと言えば

BACK INTO ENGLISH

I don't know what to say.