【往期回顾】
一课一题一语法：新概念英语第1册第127-128课
下面是第127-128课的参考答案：
【答案】
1. 他这么说，肯定是个傻子。
He must be a fool to say so.
2. 她现在不可能在办公室。
She can't be in the office now.
3. 她现在不可能在家看电视。
She can't be watching TV at home now.
专栏
【本期内容】
下面我们继续本周《新概念英语1》第129-130课的重点句型或语法的分享。先来读一读第129课的课文：
一、课文原文
专栏
二、重点句型或语法
本课继续学习情态动词must和can't表猜测的用法。
（一）must
must用作肯定猜测，表“一定”。本课侧重学习的是must对过去时间发生的状态或动作的猜测。
1、对状态的猜测
其基本用法为：
主语 + must have been + 名词/形容词/短语
如：
He must have been a teacher.
He must have been tired then.
He must have been in the park then.
2、对动作的猜测
其基本用法为：
主语 + must have been doing (强调过程，动作一直持续)
主语 + must have done (强调结果，动作已经结束)
如：
He must have been reading in the library the whole afternoon yesterday.
He must have finished the work yesterday.
（二）can
当表否定猜测时，要用can't，表示“一定不”。本课侧重学习的是can't对过去时间发生的状态或动作的猜测。
1、对状态的猜测
其基本用法为：
主语 + can't have been + 名词/形容词/短语
如：
She can't have been a doctor.
She can't have been excited then.
She can't have been at home then.
2、对动作的猜测
其基本用法为：
主语 + can't have been doing (强调过程，动作一直持续)
主语 + can't have done (强调结果，动作已经结束)
如：
She can't have been working in the garden then.
She can't have finished the work then.
三、一课一题
根据本课的重要语法点，让我们来练一练吧，请把下列句子翻译成英语。
1. 他上周肯定在上海。
2. 她前天上午不可能一直在地里干活。
3. 汤姆肯定五天前就到巴黎了。
