he has not come back homehis mother (is worrying )about him ,括号里的能换成is worried
问题描述：
he has not come back home
his mother (is worrying )about him ,括号里的能换成is worried
答
你好。完全可以：He has not YET come back home,SO his mother is worried about him
hasn't come 和 is worried --------都是“现在时”哦。
答
这里有逻辑上的先后顺序，他没回来在先，他妈妈担心在后，所以不能用过去时态。
还有不能是is worried, 应该是was warried
答
he has not come back home 完成时态,表示他没回来这个结果.his mother (is worrying )about him正在进行时,表示正担心着他 ,符合上文的语境.is worried 表示一种担心的状态,没有用进行时更形象.