I didn\'t understand anything at all .
No problem at all . 完全不成问题。
②用于疑问句，意为“究竟”，“到底”，“真的”。
Do you know it at all ?
8 . be interested in 对…感兴趣
At the age of eight he became very interested in maths .
9 . have a big smile 满面笑容
You can see from my photograph that I have a big smile and long black hair .
He had a big smile when I met him next .
10 . ask for 要求，约请
Mary asked for time to think this over .
11 . be covered with 覆盖着
The table is covered with a cloth .
The mountains were covered with snow .
二、学海导航
【学法指要】
单元难点疑点思路明晰
1 . 由 though 引导的状语从句的句型
Though I like writing to my penfriend , it takes a lot of time . 虽然我喜欢给笔友写信，但花了很多时间。
※ 由连词 though ( 虽然 ) 引导的状语从句，全句中有“但是”之意，然而 thought 与 but 不能前后连用，只能用其中一个。上句也可以说成：
I like writing to my penfriend , but it takes a lot of time .
※ though 引出的从句放在句首时，从句后面要有逗号。但也可将 though 引出的状语从句放在主句之后。
Though it was raining , he went there .
He didn\'t do this work well though he did his best . 虽然他尽了最大努力，但还是没干好这工作。
※ though 常与 even 连用，表示强调。如：
Even though I didn\'t understand a word , I kept smiling .
2 . 由 after 引导的时间状语从句的句型
But after we left the mountains behind us , there was hardly a cloud in the sky . 然而当我们把群山峻岭甩在后面后，天空几乎万里万云。
※ after we left the mountains behind us，是由连词 after 引导的时间状语从句。引导时间状语从句的还可由 when , while , before , till , since 等词引起。
leave behind 是“把 ( 某物 ) 留在 ( 某物 ) 的后面”。
由 after 引导的时间状语从句举例如下：
After we had finished lunch , we all sat on the grass .
※ after 引导的从句，有时放在主句之后。如：
I arrived at the station after the train had left .
3 . They say that… = It is said that … 据说
…and they say that there are ten sheep for every person . 据说每人占有十头羊。
句中的 they 并没有具体的对象，泛指人们 ( people ) 。
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九年级英语第二十四单元