Unit12 What did you do last weekend?
22. keep
1. 系动词，意为“保持（某种状态）”，其后常接形容词作表语。如： Please keep quiet / silent! 请保持安静！
行为动词
2. 抚养，饲养： keep chickens. 养鸡
3. "遵守；维护"。. Everyone must keep the rules. 人人必须遵守规章制度。
4. "使……保持某种状态，.keep+sb./sth.+ 形容词／副词／介词短语 .........“使...保持...状态”
例句：You should keep the door open.
Don"t keep me waiting for long.
5 .keep away意为"(使)离开；(使)不接近"，其后常接介词from。如：
Would you keep your dog away from my boy, please?
23.But I was so tired that I went to sleep early.
I was so scared that I couldn’t move.
1. “so +形容词+that 句子”，表示“太……以至于……”。
2. 辨析 so that / so… that
1）so that引导目的状语从句时，表示“以便；为了”。
I got up early so that I could catch the early bus.
2) so +形容词或副词+ that ...引导结果状语从句，意思是“如此……以致于……”。
例如：He runs so fast that nobody can catch up with him.
24.start
1. “开始；发生；发起”=begin
What time do you start school？
start to do sth. 和start doing sth. 一般情况下，两者可以互换。
He started learning /to learn English when he was only three.
2. （机器）开始、启动
How do you start the washing machine？
25.How was your weekend?句型
“How was your weekend?”用以询问对方的情况，其回答可以是：
It was great/terrible/wonderful/ good/bad..…
26. anything interesting有趣的事情
anything interesting意为“有趣的事情”即“复合不定代词+形容词”
Was there anything exciting on your birthday party?
有此用法的不定代词还有：something,everything，nothing；somebody,anybody,everybody,nobody;someone.anyone，everyone等。
27.have fun doing sth.做某事很开心
have fun = have a good time = enjoy oneself.玩得开心，过得愉快
We have fun in the park. = We have a good time in the park, = We enjoy ourselves in the park.
28.learn&study
1. learn为“学习，学会”，learn to do sth./learn from sb.向...学习，learn about sth.学习关于...
learn music, learn new words, learn to skate, learn from experience, learn from Tom
2. study为“学习，研究”，强调学习的过程，指深入系统地学习，其学习对象往往是科学，艺术和需要深入探讨，研究的问题及学科，不是单纯地获得技巧。
如：study medicine, study science, study a map, study engineering, study painting。
29. be lost
1)“走失，迷路”，相当于get lost
He was lost in the street.
2）“丢失的”，相当于be missing
My book was lost yesterday.
上个部分讲解了一般过去时的用法，同学做题目时候要注意把一般现在时和一般过去时进行区分。
一般现在时的定义
1.表示事物或人物的特征、状态。如：The sky is blue.天空是蓝色的。
2.表示经常性或习惯性的动作。如：I get up at six every day.我每天六点起床。
3.表示客观现实。如：The earth goes around the sun.地球绕着太阳转。
一般现在时的构成
1. be动词：主语+be(am,is,are)+其它。如： I am a boy.我是一个男孩。
2.行为动词：主语+行为动词(+其它)。如： We study English.我们学习英语。 当主语为第三人称单数(he, she,it)时，要在动词后加"-s"或"-es"。如：Mary likes Chinese.玛丽喜欢汉语。
一般现在时的变化
1. be动词的变化。
肯定句：主语+ be +其它。
否定句：主语+ be + not +其它。 如：He is not a worker.他不是工人。
一般疑问句：Be +主语+其它。如：-Are you a student?
-Yes. I am. / No, I"m not.
特殊疑问句：疑问词+一般疑问句。如：Where is my bike?
2.行为动词的变化。
否定句：主语+ don"t( doesn"t ) +动词原形(+其它)。如：
I don"t like bread.
当主语为第三人称单数时，要用doesn"t构成否定句。如：
He doesn"t often play.
一般疑问句：Do( Does ) +主语+动词原形+其它。如：
- Do you often play football? - Yes, I do. / No, I don"t.
当主语为第三人称单数时，要用does构成一般疑问句。如：
- Does she go to work by bike? - Yes, she does. / No, she doesn"t.
特殊疑问句：疑问词+一般疑问句。如：How does your father go to work?
动词+s的变化规则
1．一般情况下，直接加-s，如：cook-cooks, milk-milks
2．以s. x. sh. ch. o结尾，加-es，如：guess-guesses, wash-washes, watch-watches, go-goes
3．以“辅音字母+y”结尾，变y为i, 再加-es，如：study-studies
