知识点讲解1 on earth在地球上。
到底,究竟eg why on earth did do that?2 be use for sth/doing sth对于某事/做某事有用be useful to do sth做某事很有用3 be in danger处于危险中。
4stop sb from doing sth阻止某人做某事练习:
1it is time
agotoschoolbplaygamesctogohomedtodomyhomeworks
2 he often __supper at 6:00 in the evening.
a h**eb hasc is h**ingd is eating3it is 6 o’clock in the
aget upb gets upc is getting upd is getting up4we___any chinese classes on friday.
a don’t h**eb aren’t h**ingb are h**ingd are h**e5listen!the girlin the room,she sings so singingcis singingdare singsing6 the boy is __with his looks very sayingb speakingc talkingd telling7oh,what___in the next is so noisy.
a happensb is happeningc happenedd will happen
语法点拨。1.一般现在时的用法。
1)表示经常性,习惯性的动作;表示现在的状态,特征和真理。句中常用often,usually, every day等时间状语,例如:
he goes to school every day.(经常性动作)
he is very happy.(现在的状态)
the earth moves around the sun.(真理)
2)在时间状语从句和条件状语从句中,用现在时表示将来,例如:
if you come this afternoon, we’ll h**e a meeting.
when i graduate, i’ll go to the countryside.
don’t get off the bus until it has stopped.
3)有时这个时态表示按计划,规定要发生的动作。(句中都带有时间状语词)但仅限于少数动词,如:begin come, le**e, go, arrive, start, stop, return, open, close等,例如:
the meeting begins at seven.
the train starts at nine in the morning.
4)表示状态和感觉的动词。如be, like, hate, think, remember, find, sound等常用一般现在时。例如:
i like english very much.
the story sounds interesting.
5)书报的标题,**等情节介绍常用一般现在时。
2.一般过去时的用法。
1)表示过去某时发生的事,存在的状态或过去反**生的动作。
he saw yesterday.
he worked in a factory in 1986.
2)表示过去经常发生的动作,也可用“used to”和“would+动词原形”。例如:
i used to smoke.
during the vacation i would swim in the sea.
注意:used to表示过去常发生而现在不发生的动作或存在的状态。另外“be usedto+名词(动名词)”表示“习惯于…… 例如:
i am used to the climate here.
he is used to swimming in winter.
3.一般将来时的用法。
一般将来时表示将来的动作或状态,其表达形式除了“will或shall+动词原形”外,还有以下几种形式。
1)“to be going to+动词原形”,表示即将发生的或最近打算进行的事。例如:
it is going to rain.
we are going to h**e a meeting today.
2)go, come, start, move, sail, le**e等可用进行时态表示按计划即将发生的动作。例如:
i’m le**ing for beijing.
3)be to+动词原形”表示按计划要发生的事或征求对方意见。例如:
are we to go on with this work?
the boy is to go to school tomorrow.
4)“be about to+动词原形”表示即将发生的动作。例如:
we are about to le**e.
4.现在进行时的用法。
1)现在进行时表示现在正在进行的动作,由“to be+现在分词”构成。例如:
what are you doing?
2)表示感觉,愿望和状态的某些动词,如h**e, be, hear, see, like等词一般不用进行时。
5.过去进行时的用法。
1)过去进行时表示过去某一时刻,某一阶段正进行的动作,由“was (were)+现在分词”构成。例如:
in 1980 he was studying in a university.
he was reading a novel when i came in.
练习选择最佳答案填空:
___a party next weekend. i hope you can come.
a. h**e b. will h**e c. had d. would h**e
2. i __a book at home when i heard a loud noise outside the building.
a. h**e read b. was reading c. read d. had read
3my glasses?
- yes, i saw them on your bed a minute ago.
a. do you see b. had you seen
c. would you see d. h**e you seen
4. helen __her key in the office so she had to wait until her husband __home.
a. had left; comes b. left; had come
c. had left; came d. had left; would come
5.–hi, tracy, you look tired.
- i am tired. i __the living room all day.
a. painted b. had painted c. h**e been painting d. h**e painted
6.–you h**e left the light on.
- oh, so i h**e. _and turn it off.
a. i’ll go b. i’ve gone c. i go d. i’m going
7. the reporter said that the ufo __east to west when he saw it.
a. was tr**eling b. tr**eled
c. had been tr**eling d. was to tr**el
8. i __ping-pong quite well, but i h**en’t had time to play since the new year.
a. will play b. h**e played c. played d. play
9.–you h**en’t said a word about my new coat, brenda. do you like it?
-i’m sorry i __anything about it sooner. i certainly think it’s pretty on you.
a. wasn’t saying b. don’t say c. won’t d. didn’t say
10. i wonder why jenny __us recently. we should h**e heard from her by now.
a. hasn’t written b. doesn’t write c. won’t write d. hadn’t write
作文练习。同学们在郊游时,看到有些地方水资源的污染情况很严重,对此很有感触。请你根据提示,写一篇关于保护水资源重要性的文章。
提示:1水的重要性:在所有吃喝的东西中,水是最重要的。人不能不吃食物活好多天,但却是两三天就会死亡。
2某些现象:有些人意识不到水的重要性,长往江河湖泊里扔垃圾;有的工厂往江河湖泊里排废水,造成喝水污染以致无法饮用。3你的感想:谈一点你对保护水资源,保护人类健康的认识。
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