题目内容
【题目】他还没有回家，因此他的父母担心他。 (be worried about)
【答案】He hasn't come back home yet, so his parents are worried about him.
【解析】come back home回家，be worried about担心，还没有回家应该用现在完成时，即have done……yet，他为主语用第三人称单数，父母担心他，父母为双数，因此用are，所以答案是He hasn't come back home yet, so his parents are worried about him.
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