15.You are not fit at all.你一点也不健康。(P69)

(1)at all意为“一点也(不)”，常与not连用，构成句型not…at all。例如：

I’m not tired at all.

---Are you hungry?---Not at all.

not与at all连在一起，用来表示“答谢”。例如：

---Thank you.--- Not at all. (=You’re welcome.)

(2)句中的fit是形容词，意为“健康的，结实的”，相当于healthy。例如：

If you want to keep fit, you should take more exercise.

gratulations! 祝贺你(们)！(P65)

Congratulations是名词，常用复数形式，其后可接to sb.或on doing sth.，意为“向(某人)祝贺(某事)”。例如：

Congratulations to you on winning the match.

Congratulations on your success(成功).

14.Daniel spends all his free time sitting in front of the computer. Daniel把所有的业余时间都花在电脑前面。(P64)

此句型为spend some time (in) doing sth.，意为“某人花费……时间干某事”，spend后接动词，介词in可省略；spend后接名词时，用句型spend some time on sth.，意为“某人在某事方面花费……时间”。例如：

I usually spend about an hour doing my homework every day. = I usually spend about an hour on my homework every day. 我每天通常花半个小时做家庭作业。

He spends fifteen minutes walking to school.他花15分钟步行上学。

也可用it takes sb. some time to do sth.这一句型，意为“某人花费……时间干某事”。例如：

It takes half an hour to cook.要花半个小时做饭。

上面的两个例句可分别改写为：

It usually takes me about an hour to do my homework every day.

It takes him fifteen minutes to walk to school.

13.How often do they exercise? 他们多长时间锻炼一次？(P64)

How often常用于对频率的提问，意为“多长时间一次”，其答语通常是once a week, three times a month, sometimes等表示频的副词及短语。例如：

---How often do you go to see your parents?---Twice a month.--你过多久去看你父母亲一次？--一月一次。

---How often does your cousin play computer games? ---Three times a week.--你表弟多长时间玩一次电脑游戏？--一星期三次。

---How often do you go fishing?---Never, but my father does once a week.--你过多久去钓一次鱼？--从不，不过我父亲每周去一次。

12. How much do you know about food? 关于食物你知道多少？(P63)

(1)How much常用来对不可数名词的数量提问，也可用于询问价钱，还可询问抽象名词或表示事物总称的名词的数。例如：

How much milk do you need?

How much do you know about their school?

How much is the chicken?

(2)若对可数名词的数量提问，通常用how many。例如：

How many people are there in your family?

11.I plan to go swimming twice a week. 我计划一周游泳两次。(P60)

(1)go swimming意为“去游泳”。go+V-ing结构表示去进行带有娱乐性的体育活动。例如：

go running去跑步

go shopping 去买东西

go fishing去钓鱼

go skating去溜冰

(2)twice意为“两次，两倍”。例如：

Amy goes to the Swimming Club three times a week. Amy一周去游泳俱乐部三次。(P64)

对twice a week，three times a week等提问时，用How often。例如：

How often does Amy go to the Swimming Club？

10.It's time for me to change now. 我现在该改变了。P60)

此句型为It's time for +名词/代词+to+动词原形，是一个常用的句型，意为“某人该做某事了；某人做某事的时间到了；是某人做某事的时候了。”例如：

It's time for the students to play games. 学生们该做游戏了。

It’s time for us to go to school. 我们该上学了。

这一句型也可用下列句型：

(1)It's time for+名词。例如：

It’s time for class.该上课了。

It's time for lunch. 是吃中饭的时候了。

(2)It's time to+动词原形。例如：

It's time to go to school.= It's time for school. 该去上学了。

It's time to have supper.= It's time for supper. 是吃晚饭的时候了。

9.After class, I also like playing computer games and chatting with my friends on the Internet.课后我也喜欢玩电脑游戏和在网上与朋友聊天。(P60)

also是副词，意为“也”，与too同义，但also一般置于行为动词之前、be动词或助动词之后；too一般置于句未。例如：

She is also from America.= She is from America, too.

I also like singing.= I like singing, too.

either也可表示“也”，但通常用于否定句, 一般置于句未。例如：

We don’t go to school on Sundays. They don’t go to school on Sundays, either.

8.I usually have fruit and vegetables because I want to be healthy. 我通常吃水果和蔬菜，因为我想健康。(P60)

because是连词，后接表示原因的状语从句；because of后接表原因的词或短语。例如：

I like my classroom because it is big and clean. 我喜欢我的教室，因为它既大又干净。(P24)

I don’t like the mooncakes because they are too sweet.我不喜欢月饼，因为太甜了。

He can’t play football any more because of his poor leg.由于可怜的的那条腿，他不奶奶感再踢足球了。

The cake tastes delicious.这蛋糕偿起来很好吃。

5. a lot of　 许多，大量的

既可与可数名词连用，也可以和不可数名词连用。与可数名词连用时，动词是复数，与不可数名词连用时，动词是单数。

A lot of students are playing on the playground.

There is a lot of milk in the fridge.