【如题】Mary was tired________ half an hour's walk on the beach.

【如题】Mary was tired________ half an hour's walk on the beach. It is half an hour's walk from the school to the park.对half half an hour‘s walk为什么不能讲成half-an-hour walk? It’s half an hour's walk from here to the bus station --Don’ It is half an hour's walk from the school to the park.（ 对hal it is half an hour's walk from the school to the park.it_hal Mary spent half an hour on play the piano 这句话不对吗?应该怎么该? it is half an hour's walk from here to the bus station Don't It is half an hour's walk to get to the light rail station.（ ( ) ( ) ( )your house from here?Half an hour's walk. The train I was traveling on was already half an hour late. The film was on half an hour ago.同义句.The film ____ ____ ____