1. Nearly 3500 years ago, people chewed on leaves or drank a kind of tea made from leaves possessing a special chemical to reduce body pains and fever.

V-ed作后置定语，表被动。

V-ing作后置定语。

to reduce作chew on leaves and drank a kind of tea的状语

Practice:

1).We met a group of pupils ____________ from school.

(我们碰到了一群从学校回来的孩子。)

2).Is there anything _____________ for tonight? (今晚有什么活

动吗？)

3).Among the men ____________ part in the work, he is probably the most active. (在要参加这项工作的人中,他恐怕是最积极

2. Not only has aspirin proved vital for reducing fever and helping stop pain, but there are also other things that aspirin can help with.

(句中not only 位于句首,其所在的分句要用倒装结构,but also后的分句不用倒装。)

e.g.:

1.___________ did the poor man lose his job, but he was _______ sent to prison.(这个可怜的人不仅丢了工作，而且还被送进了监狱)

3. Lawrence Craven, a doctor from the USA, introduced the

idea in 1953 that aspirin had the potential to reduce the risk

of heart attacks, because it helped the blood circulate better.

because引导原因状语从句 that引导同位语从句

e.g.:

1).The news _________ we are having a holiday tomorrow is not true. (明天放假的消息不实。)

2).The fact that the money has gone does not mean it was stolen.

(那笔钱不见了这一事实并不意味着是被偷了。)

3).There is some doubt _________he will come. (他是否会来还不一定。)

4. However, in 1971, Smith and Willis from the UK proved that aspirin could have that effect, and in 1977 a study carried out in the USA showed that aspirin could prevent strokes, as well.

介词短语和V-ed短语分别作定语

两个that引导宾语从句

5.Both of these medicines have saved millions of people's lives and have proved beneficial to mankind since they were invented.

beneficial adj.有益的 be beneficial to对......有益

e.g.:

①The agreement will be beneficial to both parties.

②A good diet is beneficial to health.

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