YOU SAID:

sand castles wash away as the tide comes up

INTO JAPANESE

潮が上がると砂の城が洗い流される

BACK INTO ENGLISH

The sand castle is washed away when the tide rises

INTO JAPANESE

潮が上がると砂の城は流されてしまう

BACK INTO ENGLISH

When the tide rises, the sand castle will be washed away

INTO JAPANESE

潮が上がると砂の城は流されてしまいます

BACK INTO ENGLISH

When the tide rises, the sand castle will be washed away