【问】 He must try and do better.句中and所连接的前后两个部分是不是并列关系?
 【答】 从表面上看上列句中的and所连接的是两个并列的分句，但实质上，and所连接的两个部份并不是并列关系[有些语言学家称之为假拟并列(pseudo-coordination)]，而是动作跟动作目的的关系。He must try and do better.相当于He must try to do better.前者属非正式的口语用法，而后者属正式用法。
 1. We must try and understand. (ECD)
 我们必须努力去理解。
 2. I'll try and telephone you.(McArthur)
 我将设法给你打电话。
 3. I'll try and come tomorrow.(CGEL)
 我设法明天来。
 4. Try and finish that by next Friday. (EED)
 设法在下星期五之前把它干完。
 此外，go，come，run，hurry up和stop等动词，也可以像try一样，采用这种假拟并列：
 1. Why did you go and do a silly thing like that? (CGEL)
 你为什么去做了那样一件傻事?
 2. Run and tell him to come here at once. (CGEL)
 跑去告诉他立刻来这里。
 3.Come and have some food. (Greene)
 来吃点东西。
 4. I wish the bus would hurry up and come;I've been waiting here for hours. (CIE)
 我希望公共汽车快点开过来，我已等了好几个小时了。
 5. We ought to stop and think. (PEU)
 我们应该停下来想一想。
 但是，应当指出，在正式英语里，人们还是宁愿采用try to do的格式。例如，在TOEFL中就没有出现过try and的格式。
 1. The only thing we can do is tried to make him realize that he ought to study hard.(TOEFL，70.3)
 2. When two female elephants are fighting，one usually try to bite off the other’s tail.(TOEFL，87.1)