.常用英语标点符号及其用法在书面语，标点符号起着分隔作用，并有指明语法关系和语义的功能。现将常用标点符号的主要用法分述如下：一逗号（,）1.分隔并列成分。例：At the bookstore I bought a dictionary, a grammar book and a textbook.我在书店里买了一本词典，一本语法书和一本课本。He stood up from his seat, opened the door, and went out.他从座位上站了起来，推开门出去了。2. 分隔并列分句。例：He lives his students, and his students love him. 他爱他的学生，他的学生也爱他。We must leave now, or we will miss the train.我们必须立刻出发，不然就误了火车了。3. 分隔同位语、呼语。例：Mr. Zhang, our English teacher, will be leaving for Shanghai on Friday.
