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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