《新概念英语》同步讲义：第2册第57课
【往期回顾】
【第2册第57课讲义】
本课的重点内容是介词的用法。
本课侧重的是介词at/in/off/with的用法（可参考第9课和第33课中介词的用法）。
其中，at和in主要接地点，“in+衣服或颜色”可以表示“穿着”；off也常接方位地点，有时可以作为副词，后面无需再跟宾语；with则表示伴随。如：
1、at
A large crowd was waiting at the bus stop.On the way, we stopped at a small village called Puddleton.
2、in
There were a lot of people in the street.I would like to live in a warm country.
3、off
The pencil rolled off the table.The lid came off easily.
4、in/with
Can you see that woman in the blue coat?The police are looking for a man with a scar on his face.
本课的难点部分出现了make和let的用法区别。
两者的主动形式的用法，都是后接“宾语+动词原形（宾补）”，即：make/let sth/sb. do。如：
We cannot make him change his mind.Don't let the children touch anything in the room.
需要注意的是，make可以改为被动语态，但要恢复不定式结构to。如：
He cannot be made to change his mind.
但是，let一般不能改为被动语态，具体的大家可参考这个词典的说明：https://www.oxfordlearnersdictionaries.com/us/definition/american_english/let_1。