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考点3 be doing...when...意为“正在做……这时(突然)……”
【教材原句】. One day he was looking in a second－hand furniture shop when he saw an amazing object among the many different vases and jewels.(P3)
一天，他正在一家二手家具店里查看，这时他(突然)在众多不同的花瓶和首饰中看见了一个神奇的东西。
【句法分析】be doing...when...意为“正在做……这时(突然)……”，when在句中作并列连词。相当于and then，and at that time。
I was thinking of this when I heard my name called. 我正想着这件事时，突然听到有人叫我的名字。
I was reading a book attentively when an old friend came to see me. 我正在全神贯注地读一本书，忽然一位老友来访。 【归纳拓展】
be about to do...when...即将做……这时…… be on the point of doing...when... 正要做……这时……
had just done...when...刚做完……这时…… 【例句研读】
I was about to swim in the river when the guide told me there were man－eating fish in it. 我正要下河游泳这时导游告诉我河里有食人鱼。
He was on the point of leaving when someone knocked at the door.他正要走，这时有人敲门。 We had just fallen asleep when the bell rang. 我们刚刚入睡，铃声就响了起来。 【考点聚焦】考查be doing...when..句型结构 【即时巩固】
选择题
I had hardly got to the office my wife phoned me to go back home at once. A．when C．until 【答案】 A
B．than D．after
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①他刚刚离开，电话就响了。
He the telephone rang. ②我们正要离开，突然Jerry来了。 We Jerry arrived.
【答案】 ①had just left when ②were about to leave when 考点4 “it＋be＋过去分词＋that从句”
【教材原句】For example，it can be proved that China has more people than any other country in the world.(P5)
举例来说，中国人口比世界上任何其他国家的人口都多，这是可以得到证实的。
【句法分析】句中“it can be proved that从句”为“it＋be＋过去分词＋that从句”结构。在该结构中，it为形式主语；that从句为真正的主语。
It is proved that the method has a better effect. 实验表明，该方法不仅简单，而且效果良好。
It was proved that steam is hotter than boiling water. 蒸汽比沸水要烫的事实是被证明过的。 It is said that...据说…… It is reported that...据报道…… It is believed that...人们认为/相信…… It is suggested that...人们建议…… It is hoped that...人们希望……
有的“It is＋过去分词＋that从句”结构可与“sb./sth.is＋过去分词＋to do...”结构相互转换。 【例句研读】
It is said that he studied abroad，but we don't know which country he studied in. ＝He is said to have studied abroad，but we don't know which country he studied in. 据说他在国外学习过，但是我们不知道他在哪个国家学习了。 It's hoped that the war would end soon. 希望战争不久即可结束。
It's said that thirteen is an unlucky number. 据说13是一个不吉利的数字。
It is suggested that the work should be done with great care.根据建议工作应该仔细完成。 【考点聚焦】“it＋be＋过去分词＋that从句” 【即时巩固】
一句多译
据报道，献血(donating blood)对身体有好处。(2种)
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【答案】 ①It is reported that donating blood does good to health. ②Donating blood is reported to do good to health.
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