4、ss课后18.beinterestedin…对.......感兴趣dependon依赖;取决于dosth.onone’sown独立做某事worryabout为...而担忧二.重点句型1.Whataboutdoingsth?2.by的用法a.介词 prep. (指交通等)乘;例:They went to Shanghai by plane. 他们坐飞机去上海。b.表示做某事的方式、方法结构:by+V-ingHowdoyoustudyforatest?Istudybymakingwordcards.3.现在完成时态结构:havedone,表示例:Ha