Lesson 23,Which glasses?,New words and expressin,on prep. 在之上,shelf n. 架子，搁板 on the shelf,语法定语：定语：是修饰限定的成份，做定语的词一般是形容词，但也可用介词短语或定语从句做定语。介词短语做后置定语：a book on the desk定语从句：This is the boy I saw yesterday.,Study,Give sth to sb =give sb sth,Which glasses?=which glass? (单数形式）,This theseThat those,Ones=glasses,
