Yesterday it [be] very cool .but tomorrow it [be] not 适当形式填空

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Yesterdayit[be]verycool.buttomorrowit[be]not适当形式填空Yesterdayit[be]verycool.buttomorrowit[be]not适当形式填空

Yesterday it [be] very cool .but tomorrow it [be] not 适当形式填空
Yesterday it [be] very cool .but tomorrow it [be] not 适当形式填空

Yesterday it [be] very cool .but tomorrow it [be] not 适当形式填空
yesterday是过去式的标志,用过去式 was
tomorrow是将来时的标志,用 will be

was
will be

it was ... will be