YOU SAID:

I don’t know if we are going to do it or not but

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やるかどうかはわかりませんが

BACK INTO ENGLISH

I don't know if I will do it

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ぼくに出来るかわからないよ

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I don't know if I can do it.

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ぼくに出来るかわからないよ

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I don't know if I can do it.