不久以前，在海南和其他地方人们还不能进行潜水运动。
else 形容词，意思为“别的；其他的”，无比较级。
它常接在疑问代词，不定代词后面。如：
— Beside the weather, what else did he say? 除了天气，他还说了些什么？
— He said something interesting about his travel abroad. 他说了国外旅行的趣闻。
— Who else is coming? 还有别人来吗？
— We are preparing the dinner. 我们正在准备饭。
— Anything else I can do for you? 我还能为你做些别的事吗？
— No, thank you. You’ve already done so much for me. 不用，谢谢。你已经为我做了很多。
2. This is because there was no machine allowing a person to breathe under water for a long time. 这是因为没有供人水下呼吸很长时间的机器。
allow sb. to do sth. 意思为“允许某人做某事”。 相当于宾语时，必须接不定式。如：
They don’t allow children to go into that room.= They don’t let children to into that room.
他们不允许孩子进入那个房间。
I allowed him to use my room.= I let him use my room.
我让他使用我的房间。
当allow后接不接人称代词或名词时，后面的动词须用 –ing 形式，而不能用不定式。如：
My parents don’t allow us to smoke. Smoking is not allowed both at home and at school.
我父母不允许吸烟。
注意：这一用法中的allow不能用let替换。
3. In 1943 Jacques Cousteau and his friend made it possible by inventing the scuba machine.
1943年雅克·库斯托和他的朋友发明了水下呼吸器，才能使这成为可能。
make在这里是“使得”的意思，后接不带to的动词不定式。“make sb. do sth.” 意为“让 / 使得某人做某事”。make后还可以跟形容词作宾补。如：
The boss made the workers work twelve hours a day.
老板让工人们一天工作十二小时。
His mother was ill. This bad news made him sad.
他的母亲病了，这个坏消息使他很难过。
4. He was amazed at all the colours, and all the beautiful fish.
他对五颜绿色和各种美丽的鱼感到惊奇。
(1) amazed 使（某人）感到惊奇。
She amazed us by dancing so beautifully. That’s why we enjoyed every minute of the party.
她舞跳得如此美，使我们很惊奇，这也使我们聚会时度过了美好时光。
be amazed at / by 感到惊奇。如：
We are amazed at the changes in Beijing. I can’t even find where my old house is.
北京的变化使我们感到惊奇。我几乎找不到旧房子了。
She was amazed by what she saw in China. She is now planning to bring her whole family here next month.
她在中国所见到的情景使她感到惊奇。她正打算下个月把家人都接来。
(2) fish 指“鱼肉”时是不可数名词，指“鱼的种类”时是可数名词。单复同形指“同一种类的鱼”，而fishes复数形式指不同种类的鱼。如：
We had fish for dinner.
我们正餐吃鱼。
We caught five fish.
我们抓到了五条鱼。
上学期 Unit 6 Mainly revision