高三英语同步课程
《完形填空之词语辨析》麻雪玲
点击试听好老师
老师传授典型题详细办法
教学生举一反三
一题多解、一题巧解
错题本
错题追踪复习
听课中的错题能自动加入错题本
课后可方便复习及导出错题本
网络答疑
课程互动性强
互动问答
数理化英快速答疑
课后练习
经典例题课后练习
老师针对课堂中的经典例题
为学生推送同类型题，掌握解题方法
unless 和 not …until 的区别
unless 引导从句时多强调条件，而not …… until 句型则强调时间。Unless 连接的主从句的时态一般是主句是将来时而从句现在时。not …… until 连接的主从句中可以使用多种时态。
比较：
(1) You will fail in the exam unless you listen to the teacher carefully in class.
(2) We won't start until Bob comes.
(3) He didn't find out what had happened until his wife told him about it.
5. Don't touch anything unless your teacher tells you to do.
在此句末的to后省略了touch。在英语里，有些动词像hope, like, want, try, need, 助动词如be able to., be going to之后，为了避免前后重复，往往只用一个to代表动词不定式。
(1) You can go with me if you'd like to.
(2) You may stay at home if you want to.
(3) I don't want to go there, but he's going to.
6. What about when we leave?
What about ……?与How about ……?可以用来询问消息、提出建议或征询意见，其后可接名词、代词、动名词、副词(如next)和状语从句等。
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