1. [原文]Have you ever watched someone surf? （L. 6）surf是动词，在这里怎么用原形？
[精析] surf是省去to 的动词不定式，在这里作感官动词watch的宾语补足语。类似用法还有，感官动词look at, see, listen to, hear, 使役动词let, have，make等，后都可以接省去to的不定式作宾补。
2. [原文] Now it is enjoyed by people all over the world. (L. 6) is enjoyed是什么谓语形式？all over是什么用法？
[精析]is enjoyed是被动语态形式。当主语为动作的承受者时，谓语要用被动语态形式，即be + 过去分词形式。这部分内容在今后还要学到。
all over是“全部、浑身、在各地”的意思，可单独使用，也可在其后接相应的词语。例如：
People all over the world love peace.全世界的人民都热爱和平。
He is wet all over.他全身都湿了。
all over the world 也可以用all the world, the whole world 来表示，但一定要注意冠词的位置。用all 时，冠词放在all之后，用whole时，冠词放在whole之前。
3. [原文] Every year...attract large numbers of tourists to the islands. (L. 6) large numbers of与a large number of 有区别吗？
[精析]没有。这两个短语都表示“许多”的意思，可以互换。如：Large numbers of / A large number of people came to the meeting from all over the country. 许多来自全国各地的人参加了会议。但是a number of / numbers of 与the number of是有区别的。作主语时，前者后接复数名词，谓语用复数形式；后者意思是“为……的总数”，后接复数名词，但谓语要用单数。试比较：
A number of students are playing in the playground.许多学生在操场上玩。
The number of students in the playground is about one hundred.操场上的学生（数量）大约有一百人。
4. [原文] For example, Jake Booth, a 21-year-old man, gave up his job in San Francisco a year ago. (L. 6) 21-year-old中的year怎么不加s？
[精析] 21-year-old是由数词 + 名词 + 形容词构成的复合形容词，其中year不可以用复数形式，词与词之间用连字号。试比较：
He is a 15-year-old boy.他是一个15岁的男孩。
The boy is 15 years old.这个男孩15岁。
另外，句中give up意思是“放弃”，作及物动词，后可以接动名词；也可以接代词，用宾格放于up之前。也可用作不及物动词。例如：
You should give up smoking. I gave it up last year.你应该戒烟。我去年就戒掉了。
She doesn't give up easily.她做任何事情都不会轻易放弃。
5. [原文] Although I haven't got a very good job, surfing keeps me very fit.( L. 6) although与though用法相同吗？
[精析] 有共同之处，也有不同点。两都可用来引导让步状语从句，表示汉语的“虽然……但是……”。但不能说although / though...but...。如：不能说：Although / Though he is very old, but he is still quite strong. 句中的but 应去掉。Although是较为正式的用语，引导的从句多位于主句前，though多用于非正式文体中，引导的从句位于主句前后都可。
注意：though可用于倒装句中，although不可。如：Young though he is , he has worked for a few years.他虽然年轻但已经工作好几年了。
6.[原文] He's gone to New Zealand on business. (L. 7) business前可以加定冠词the 吗？
[精析] 不可以。on表示“处于……状态中”，与一些名词构成特定的词组，on business出差。再如：on duty值日，on fire着火了，on holiday在度假。这些固定词组中都不能加冠词。
7. [原文] On May 17, 2001, on his 13th birthday, his dream came true.(L. 8) come true是“实现”的意思，realize也有这一意思，它们的用法一样吗？
[精析] 不一样。这两个词语虽然可以表示同一个意思，但句法结构不同。come true的主语应是某事，而realize的主语应是某人。试比较：
His dream has come true.他的梦想实现了。
He has realized his dream.他实现了他的梦想。
另外，表示某人几岁生日是：one's + 序数词 + birthday。如：Tom's 10th birthday.
8. [原文] He went on cycling for another two hours before he finished his journey. (L. 8) 句中的journey与trip, travel均可表示“旅行”，有区别吗？
[精析] 有区别。这三个词都表示“旅行”的意思。journey 一般指较远距离的旅行，指单程；trip用得比较广泛，可以是“旅行”，也可以是“去了一下”，但都指一个往返；travel一般指到国外或远方旅行，不着重某一个目的地，有到各地“游历”的意思。请看例句：
He made a journey from Paris to Berlin.他作了一次从巴黎到柏林的旅行。
I took several trips to Guilin.我去过桂林几次。
He returned from his travels.他旅行结束回到家里。