人教版(新课标）必修二-Unit4 Wildlife protection Language points课件(43张ppt)

(共43张PPT)
Unit4 Wildlife protection
Language points
Cara. liang
l。 decrease v.&n.减少:降低
The number of whales has decreased sharply these years.
There has been a steady decrease in the number of visitors
since the beginning of the new year
decrease sharply / steadily
a sharp /steady decrease
decrease to减少到
decrease by减少了
The number of new students decreased fram 320_a_260
this year.
increase decrease
练一练]选择 decrease/increase并用其正确形
式填空。
The number of visitors has decreased
sharply in the past two months. The
decrease worries the manager. "Something
must be done to increase the number of
visitors.” he thought
近义词短语: go down fall drop
P25 As a result these endangered animals may even
die out.结果,这些濒危的动物甚至可能会灭绝
diei.不能用于被动语态
die的五种基本形式分别是:
过去式died
过去分词ded
现在分词 dying
形容词dead
名词形式 death
【注意】die可以用于进行时态,表示“即将死去;奄
奄一息”。例如
He is dying.他快要死了
die out::1 disappear completely灭绝2逐渐消失
With society developing, many customs are dying out.
★ die away:( sound,wind, or light)(指声音,光,风)
慢慢消失,慢慢变弱
He hid behind the door until the footsteps had died away
★ die off:相继死去;(草木)先后枯死
★ die down逐渐减弱,逐渐模糊(平息)兴奋,生气,火等
★ die for渴望,殉难,迫切想要 be dying for渴望
★ die of/from因.而死
疾病饥寒,情感原因造成的死亡一般用 die of(内因),
除此之外的原因造成的死亡用 die fron(外因)