一个名词（或其它形式）对另一个名词或代词进行修饰,限定或说明,这个名词（或其它形式）就是同位语.同位语与被它限定的词的格式要一致,并常常紧挨在一起.同位语从句即重复说明同一个称谓或事件的从句.名词作同位语Mr Wang,my child’s teacher,will be visiting us on Tuesday.王先生,我孩子的老师,星期二要来看我们.（在这里'my child's teacher'做同位语修饰'Mr Wang')短语作同位语I,the oldest girl in the family,always had to care for the other children.我,作为家里最大的女孩,总是要照料家中的其他孩子.直接引语作同位语But now the question comes to their minds,“Did she die young because she was a clone?”但是现在他们不得不思考这样的问题：“多莉早死是因为它是一只克隆羊吗?”句子作同位语The girls were surprised at the fact that ocean ships can sail up the Great lakes.巨大的海轮可以开到五大湖,让表姐妹俩感到吃惊.