他当然同意了，然而我不同意。
注：however与but的区别在于，前者较为正式，but不能置于句首，而however 可以置于句首，句中或句末。置于句中时，前后用分号隔开的情况较多。
6. Since water covers most of the earth, Corsteau knew we should keep the seas clean.
由于水覆盖了地球的大部分，库斯托知道我们应该保持海洋清洁。
（1）since与because的区别在于，since常用于指众所周知的原因，而Because常用来回答Why的提问。
Since we are young, we should do more for our country.
既然我们年轻，我们应当多为国家做事。
— Why is Kate absent? 凯特为什么迟到了？
— Because she is ill. 因为她病了。
（2）本句中cover的用法，意思是“用……遮盖；覆盖”。
Snow covered the ground. 雪覆盖了地面。
She cried and covered her face with her hands. 她哭了，用手蒙住了脸。
The desk was covered with dust.= Dust covered the desk. 书桌上布满了灰尘。
7． …, he encouraged everyone to take part in protecting our lakes, rivers, seas and oceans.
……，他鼓励每个人加入到保护我们的河流、湖泊和海洋的行动中来，take part in意为“参加（活动）”一般表示在活动中还承担一定的职责。
He always takes an active part in all kinds of activities in school.他总是积极参加学校各种活动。
join也有参加的意思，但是该词主要强调参加某项组织。如：He joined the party when he was eighteen years old.他十八岁就入了党。
8.— … but I’ve gone scuba diving. — So have I.
— ……但是我去潜水了。 — 我也去了。
“So＋be/情态动词/助动词＋主语”这种简略结构表示“某人也……”如：I like green very much. So does Lily. 我喜欢绿色，莉莉也喜欢。
Tom can swim, so can I. 汤姆会游泳，我也会游。
She is a student. So are they. 她是学生，他们也是。
I went to the zoo yesterday. So did Mary. 昨天我去了动物园，玛丽也去了。
so＋主语＋be/情态动词/助动词，这种结构强调“……确实如此”。如：Her husband is English. So he is. 他丈夫是英国人。是的，他是。
Tom studies very hard. So he does. 汤姆学习很努力。是的，他确实很努力。
She passed the exam. So she did. 她通过了这次考试。是的，他确实通过了。
9. I’ve been down as long as two hours. 我在水下待了两小时之久
as long as …长达……
It took us as long as four hours to get over the mountain.我们花了四个小时才翻过了那座山。
Mr. Brown spent as long as two and a half years writing the novel.
布朗先生花了长达两年半的时间才写完这部小说
注：类似的用法还有as much as, as large/big as, as wide as, as high as等等。如：
Look at the tower, it is as high as sixty metres. 看那座塔，它高达60米。
I spent as much as ten thousand yuan on the piano. 买这架 《九年级英语总复习教案B3U6》出自：www.89xue.com网
www.89xue.com 钢琴，我花了多达一万块钱。
注意：as long as这个短语还可以做从属连词用来引导条件状语从句。意思是“只要……”，也可以说；so long as。如：As long as I live, I’ll study. 只要我还活着，我就要学习。
You may borrow the books so long as you keep it clean.
只要你能保持书的清洁，你就可以借书。
As long as we don’t lose heart, we’ll find a way to overcome the difficulty.
只要我们不灰心，我们就能找到解决问题的出路。
10. Maybe we can go scuba diving sometime. 也许改天我们能潜泳。
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