作业帮名词做同位语时需加逗号么
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/09 23:04:23
名词做同位语时需加逗号么
But now it is realized that supplies of some of them are limited,and it is even possible to give a reasonable estimate of their “expectation of life”,the time it will take to exhaust all known sources and reserves of these materials.
名词做同位语时前面需加逗号么 怎么有的句子没有加,而有的却加了逗号?如这个句子 the time 前面加了都好的
But now it is realized that supplies of some of them are limited,and it is even possible to give a reasonable estimate of their “expectation of life”,the time it will take to exhaust all known sources and reserves of these materials.
名词做同位语时前面需加逗号么 怎么有的句子没有加,而有的却加了逗号?如这个句子 the time 前面加了都好的
同位语前的逗号可加可不加,其实没有多大规则,举个例子,Our teacher, professor Wu, has been to America. (我们的老师吴教授去过美国.)同时Our teacher professor Wu has been to America.也是可以的.如果非要说有什么规则,倒是有个惯例,如果同位语很长,那一般加逗号,例：Helen falls in love with Jack, a son of an artist.（海伦爱上了艺术家的儿子杰克.）