2.并列句：一个句子当中包含两个或更多互不相依存的主谓结构，中间用一些连接词连接起来的句子。并列句不能只用逗号隔开，而要用连接词连接。连接词：(1)并列关系句型：连接词有and, as well as, either…or…，neither…nor…,not only…but also… eg: Last year I met kate and we became friends. Either my uncle can do it, or my aunt can do it。
(2)转折概念并列句型：转折词有but eg: It has no mouth,but it can talk。(3)对比关系的并列句型： eg: He liked sports,while I would rather collect stamps。
练习：2009年6月阅读 Cerling’s team collected tap water samples from 600 cities and constructed a mop of the regional differences。(简单句) Most hydrogen and oxygen atoms in water are stable , but traces of both elements are also present as heavier isotopes.(并列句)简单句和并列句是复合句的基础，只有夯实基础，才可能笔下生辉，以上内容你掌握了吗？