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【课文讲解】
1、Yesterday a beggar knocked at my door.
★knock ① vi. 敲门I knocked, but no one answered.. knock at 敲（门、窗等） knock at the door；knock at the window
② vt.&vi. 碰撞You always knock things off the table. 你总是碰掉桌上的东西。
Jim was knocked over by a bus this morning. 今天上午吉姆被一辆公共汽车撞倒了。
She has knocked a cup over again.她又碰倒了一杯子。③ vt. 把（某人）打成……状态
He knocked Tom out yesterday. 他昨天把汤姆打昏过去了。
④ 与off连用时有一些特殊含义，一般用于口语 vt. （价格上）减去，除去，打折扣
They knocked five dollars off the price of the coat. The shop assistant knocked 10% off the bill.（He reduced the price by 10%.）
vi. 下班，停止，中断（工作等）
When do you usually knock off? 你一般何时下班？ He knocked off for lunch at half past eleven. 他十一点半休息吃中午饭。
2、He asked me for a meal and a glass of beer.
ask (sb.) for sth =request for sth. 问某人要什么东西 （for为了这个目的去请求某人, sb.更多的时候不出现, ask for sth.）
The boy asked (his parents)for money again.
3、In return for this, the beggar stood on his head and sang songs.
in return for this 作为对……的回报，作为交换 I'll buy a present for him in return for hospitality. in return 作为回报
In return for your help, I invite you to spend the weekend with my family.
He doesn't want anything in return. 他不想得到任何回报
stood on his head 倒立
stand on one's hands 用手着地(hand单数就是一只手, 双手复数)stand on one's knees 跪着, 膝盖 lie on one's back 仰面躺着
lie on one's side 侧躺/lie on one's stomach 趴着 4、Later a neighbour told me about him. 介词about可以和一些动词连用，以表示―关于……（的）‖、―涉及……（的）‖ Please tell me about the accident.
tell sb. about sth. 告诉某人某事（about关于, 通过其他事自己得出的结论）
tell you about the word 解释这个单词的意思 tell sb. sth. 告诉某人某件事(把事情直接告诉) 5、Everybody knows him.
everybody作主语一定作单数看待, 属于不定代词 所有的不定代词作为主语一律为单数看待 : somebody，anybody，everything等
6、He calls at every house in the street once a month and always asks for a meal and a glass of beer. calls at 光顾，拜访
in the street（英国）/on the street（美国） once a month 一个月一次, 单位表达方式
once adj. 表示每……一次（表示频率时后面直接加表示时间的名词）, 计量单位 ―/‖ （每……） five kilometers an hour
He goes back to the South once a year. 【Key structures】 A, The and Some
当表示不确定的某个人或物时，用不定冠词a/an（单数, 可数名词）；当表示不可数的名词时，则需要由不定冠词加量词组成词组。
在表示一种笼统概念（某某一类/一种东西）的陈述句中可以省略a和some
A tiger is a dangerous animal. /Tigers are dangerous. Salt is necessary for/to us all.
