二结合预习的内容完成下列词形转换：
1. ashamed à shame (n.)à shameful (adj)
2. attractive à attractive (adj)à attraction (n)
3. overweightàweight (n .体重)àweighty (adj )àweightless (adj.失重)
4. comfortà comfortable (adj)
5. uselessàuseful (adj.)有用的à use (n.)用途
6. peaceful àpeace (n). 和平
