Question

10．这位严格的老师经常警告她的学生要么按时上交作业，要么不能通过这门课．
The strict teacher often warns her students thateither they hand in their homework on time or they will fail her class．．

Answer 1

分析 either they hand in their homework on time or they will fail her class．

解答 答案：either they hand in their homework on time or they will fail her class． 这里是作为warn的宾语从句，主句是一般现在时，从句时态不受限制，这里表示要么…要么…用either…or…连接两个对等成分，这里我们是要连接两个句子，她的学生要么按时上交作业，用一般现在时，主语是they代替前面的her students，交作业hand in their homework 按时on time，故either they hand in their homework on time，要么不能通过这门课，是说将来的事情用一般将来时will+动词原形，不能通过用fail后直接加上名词her class，故答案是either they hand in their homework on time or they will fail her class．

点评 either…or…主要用于表示选择，其意为"要么…要么…""或者…或者…"，用于连接两个性质相同的词或短语．如：
You can have either this one or that one．你拿这个或那个都可以．
 either…or…连接两个成分作主语时，谓语动词通常与其靠近的主语保持一致．如：
Either you or I am to go．你或我必须有人去．
Either he or you are right．要么他对，要么你对．
 either…or…除可连接两个词或短语外，有时也可连接两个句子．如：
Either you must improve your work or I shall dismiss you．要么你改进工作，要么我就辞退你．
Either you'll leave this house or I'll call the police．你要是不离开这座房子，我就叫警察来