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课题
八年级下新书预习
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· 重 点 词 汇 应 用
Unit 1: Has it arrived yet?
1、 What are you up to?
be up to 以为“从事于、忙于”,What are you up to? 常用语口语中,相当于What are you busy doing?
扩展:
1 be up to sb “由某人决定”
2 up to+数量/ 程度 “达到、多达”
3 What’s up? “怎么啦?” = What’s wrong?
2、 I’ve just made a model
辨析:
just
刚
adv. 仅仅、只不过相当于only
现在完成时I have just finished my homework.
He is just a child, don’t be too strict with him.
just now
刚才,相当于
a moment ago
一般过去时
I saw him just now.
just then
就在这时候
过去进行时
It was just then that he heared the cry in the grass.
就在这个时候,他听到了草丛里的叫声。
3、 That’s why it’s on the news.
That’s why 意为“那就是…的原因”,why在这里引导表语从句,对主句进行解释说明,从句需要用陈述句语序。Jane is hardworking and helpful, that’s why I should learn from her.
※这里的that不能用this替换
类似的用法还有That’s because “那是因为”。 He didn’t come to school, that’s because he was ill.
4、 So have they discovered life on Mars?
辨析:
discover
发现存在但未知的
Modern astronomers have discovered a million such galaxie.
find
找到(强调结果)
I helped her find her bag just now.
find out
经过调查查明、找出
Please find out where they live.
invent
发明创造出前所未有的
Edison invented the electric light bulb.
5、 Mars is very far away, much farther than the moon.
farther 做形容词时表示“更远的”(是far的比较级),也可以表示“进一步的”
另外还有副词词性,表示“更远地、此外,更进一步地”
Unit 2: We have not found life on any other planets yet.
1、Scientists think that there has been life on the earth for hundreds of millions of years.
① there has been是there be句型的现在完成时,表示“有…”
② hundreds of millions of表示“数亿”
hundreds of表示“几百”,millions of 表示“几百万”,他们都能加可数名词复数,但前面不能有具体的数字,但可以与many、several、some等表示不确定的数目连用,类似的用法还有thousands of和billions of
4 辨析:on the earth 在地球上,在世界上
on earth 究竟、到底
2、None of them has an environment like that of the earth
① 辨析:
none
指三者或三者以上的“都不”,既可以指人又可以指物,可以单独使用,也可以和of构成none of+名词复数,谓语动词单复数都可以。用来回答how many和how much提问的问句。反义词是all
None of the guest want/ wants to stay。 客人中没有一个想留下来。
no one
泛指“没有人”= no body,只能指人,不和of连用,一般回答who提问的句子。
No one is going to the concert tomorrow. 明天没有人来音乐会。
neithe