你这段写的很好,只有三个细小的地方,第一个分句最好加一个novel,后面的which like是不对的,缺少宾语,你要么省略which is,用just like这样的,或者直接用which is.最后一句could后面直接跟原形,不能用to do形式,要么是could dreams be achieved,或者could dreams come true.下面是我改好的段落：
In John Steinbeck’s novel, Of Mice and Men, dreams are the source of power and hope for
homeless workers when their futures seem dim. Life without dreams is meaningless just like the walking dead. But could dreams come true?