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必修2《Learning about Language》新课标PPT课件优质课下载
Some scientist think it came after an unexpected incident when a huge rock from space hit the earth and put too much dust into the air.
Others think the earth got too hot for the dinosaur to live on any more.
Nobody knows for sure why and how dinosaurs disappeared from the earth in such a short time.
There are many different species of dinosaur and all of them have been found in China.
2. Not long ago, a rare new species of bird-like dinosaur was discovered in Henan Province.
Liaoning
several
True or false
True or false
3.Some scientists are sure dinosaurs died out because the earth got too hot for the dinosaurs to live on any more.
4.Dinosaurs died out quickly about 65 million years ago and many animals have died out in the same way.
think
Language points
1.They lived on the earth tens of millions of years ago, long before humans came into being.
千百万年前,早在人类产生之前，它们就生活在地球上。
come into being的意思是“开始存在;发生”.
我们不知道这世界是什么时候存在的。 We don’t know when the world came into being.
long before早在…之前很久，很久以前
It will (not) be long before +从句(不久后将会....)主句用一般将来时，从句用一般现在时
It would (not) be long before +从句(不久后将会....)主句用过去将来时，从一般过去时
拓展：before long 不久以后
Ex. It ___ long before we___ the result
Of the experiment.
A. will not be; will know B. is; will know
C. will not be; know D. is; know