Unit5
(一)by sea，by the sea，in the sea，on the sea
(1)by sea “走海路，乘船”，用来表示交通方式，同by ship同义。
e.g.They often travel by sea in summer.
夏天他们常常乘船去旅行。
These heavy boxes should be sent by sea.
这些重箱子应由海路运送。
(2)by the sea “在海边”，相当于on the coast。
e.g.There are many travellers by the sea.
海边有很多游客。
The children enjoyed themselves by the sea on Children’s Day.
儿童节孩子们在海边玩了个痛快。
(3)in the sea “在海里，在海水中”
e.g.There are many plants and animals in the sea.
海洋中有很多动植物。
He prefers to swim in the sea.
他更喜欢在海中游泳。
(4)on the sea “在海上”，也有“在海边”的意思。
e.g.It was reported that many boats sailing on the sea had been lost.
据报道，在海上航行的很多船只失踪了。
I want to live in a town with a beautiful position on the sea.
我想到一个位于海滨，地点甚佳的城镇去生活。
(二)be afraid，be afraid to do sth.，be afraid of(doing)sth.
(1)be afraid意为“担心，害怕”，多用于口语，常用来表示一种歉意，或遗憾，后可接so或that，也可接that从句。I’m afraid(that) 其语意相当于I’m sorry，but…。
e.g.-Are we on time?
我们准时吗？
-I’m afraid not.
恐怕不准时。
-Are we late?
我们迟到了吗？
-I’m afraid so.
恐怕迟到了。
I’m afraid I can’t help you.
恐怕我不能帮你。
I’m afraid you’ll get caught in the rain.
恐怕你要淋雨。
(2)be afraid to do常表示“由于胆小而不敢做某事”。
e.g.She is afraid to be here alone.
她不敢单独呆在这里。
He is afraid to jump into the river from the bridge.
他不敢从桥上跳进河里。
(3)be afraid of(doing)sth.常表示“担心或害怕某事(发生)”。
e.g.He was afraid to walk across the one-logged bridge because he was afraid of falling into the river.
他不敢过那个独木桥，因为他担心会掉进河水里。
I was afraid of hurting her feelings.
我担心伤害她的感情。
We are not afraid of difficulties.
我们不怕困难。
(三)high与highly
(1)high既可用作形容词，也可用作副词，表示具体的“高的”“高地”之意。
e.g.The wall is two metres high.
这堵墙有两米高。
They were climbing a high mountain.
他们在爬一座高山。
Can you jump that high?
你能跳那么高吗？
The kite was flying high in the sky.
风筝在天空中高高地飞翔着。
(2)highly是副词，表示抽象的意思，“高地，高度地”。
e.g.He is a highly skilled worker.
他是一个高度熟练的技术工人。
The headmaster thought highly of our work.
校长高度评价了我们的工作。
英语中还有一些类似用法的副词。
e.g.He went on working until deep into the night.
他继续工作到深夜。
I was deeply moved by his words.
我被他的话语深深地感动了。
Open your mouth wide，please.
请把嘴张大。
English is widely used in the world.
英语在世界上得到了广泛地使用。
(四)finally，at last，in the end
三者均可表示“(经过周折、等待、耽误)最后，终于”之意。不同的是finally一般用在句中动词前面，而at last与in the end的位置则较为灵活；三者中at last语气最为强烈，且可单独作为感叹句使用。
e.g.After putting it off three times，we finally managed to have a holiday in Dalian.
经过三次延期之后，我们终于在大连度了一次假。
At last he knew the meaning of life.
他终于明白了生命的真谛。
Smith has passed the exam at last.
史密斯终于通过了考试。
The tax-man always gets you in the end.
收税的人最后总是能找到你的。
But in the end he gave in.
但他最后还是屈服了。
At last!Where on earth have you been?
总算找到你了！你到底上哪儿去了？
另外，finally还可用在列举事项时，引出最后一个内容，相当于lastly。
e.g.Firstly，we should make a plan;secondly，we should carry it out;finally we should make a conclusion.
首先，我们要制定计划。其次，我们要执行计划。最后，我们要进行总结。