decrease by...减少了……
decrease from...to...从……减少到……
③on the increase 在增加
【即时巩固】
介词填空
①There has been some decrease
traffic accidents this year.
②The club members decreased
two hundred compared with last year.
③The housing price is hoped to decrease
10% this year.
④To our delight,varieties of birds in the forest are
the increase.
考点3.certain adj. 确定的;无疑的;某(种)
【教材原句】They allowed tourists to hunt only a certain number of animals if they paid the farmers.(P26)如果游客付给农民钱的话,他们允许游客来猎取一定数量的动物。
【例句研读】
There is a certain Mr.Smith on the phone for you.
有位史密斯先生打电话找你。
I was certain that he had seen me.
我肯定他已经看见我了。
【归纳拓展】
be certain of/about...对……有把握,确信……
be certain to do sth.确定做某事
make certain of/about/that...确定某事
It is certain that...一定能……
for certain=for sure确定无疑地,准确地
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