将下列短语改写成用加's来表示所有关系的短语。急急急急 a walk of half an hour

a walk of half an hour the bikes of Helen and Jane the ships of the children
the sister of John at she shop of uncle John the room of Helen and Jane

half an hour's walk

尽管人为的构词法有这样的half-an-hour walk / ten-minute walk,但其前面带有连字符都是作形容词使用,它们只用于句子中且其前面必须加上冠词,单纯的不构成词组,不符合语法规则,因此,这里不可取. half-an-hour-walk=half an hour‘s walk / ten-minute-walk=ten minutes' walk 可单独用作词组短语. 二楼的别眉毛胡子一把抓,肆意误导,张冠李戴!!