YOU SAID:

When are we going to the party

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私たちはパーティーにいるとき

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When we're at the party

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私たちがパーティーにいる時

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When we have a party

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パーティがある場合。

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If you have a party.

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パーティがある場合

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If you have a party

INTO JAPANESE

パーティがある場合

BACK INTO ENGLISH

If you have a party