她每周三学英语 汉译英

three times a week

Exercise 30 minutes a day a week, three or four times

不太地道,可以说 Discount on every Wednsday.

the liner is once a week.
.is twice a week.
.is three times a week.

设上英语课的时间为X+2N1天,上美术课的时间为X+7N2天,且N1,N2为正整数令X+2N1=X-3+7N2则N1=2,N2=1为最小值,且它们重复的时间为14天的倍数
所以4天时上这二种课,即第二次为7月18日 ,第三次为8月1日,第四次为8月15日,第五次为8月29日、、、、、、

We practice swing twice every Wednesday and Saturday

亲爱的 有练字用的练字薄 一般文化用品店都有卖的 买一本七年级上册语文楷书字帖 把里面的字都抄在练字薄里面 就好了

Do exercise thirty minutes per day and three to four days a week

1.lingling swims every saturday.
2.he often goes to school by bike.
3.she studies Engilsh every wendnesday.
4.daming plays ball every afternoon.
5.tom drinks milk every morning.

解题思路：（Ⅰ）本题可以分为三步，根据分步计数原理可得．
（Ⅱ）分两类，第一类，数学课排在第一节，第二类，数学课不排在第一节，根据分类计数原理可得，
（Ⅲ）分四类，第一类，语文数学排在上午，两节自修课也排在上午，第二类，语文数学排在下午，两节自修课也排在下午，第三类，语文数学排在上午，两节自修课排在下午，
第四类，语文数学排在下午，两节自修课排在上午，根据分类计数原理可得

（Ⅰ）第一步先排数学、物理、化学，第二步再排两节自修课，第三步再排剩余的科目，根据分步计数原理得共有
A34•

A24

A22•
A33=864种排课方法．
（Ⅱ）分两类，第一类，数学课排在第一节，有

A77

A22=2520种排课方法，第二类，数学课不排在第一节，
A16•
A15•

A66

A22=10800，故共有2520+10800=13320种排课方法．
（Ⅲ）分四类，第一类，语文数学排在上午，两节自修课也排在上午，故有2•
A44=48种，
第二类，语文数学排在下午，两节自修课也排在下午，故有2•
A44=48种，
第三类，语文数学排在上午，两节自修课排在下午，
A22•
C24•
A33•
A22
C23=432种，
第四类，语文数学排在下午，两节自修课排在上午，
A22•
C24•
A33•
A22
C23=432种，
故共有48+48+432+432=960．

点评：
本题考点： 排列、组合及简单计数问题；计数原理的应用；排列、组合的实际应用．

考点点评： 本题主要考查了分步分类计数原理，如何分类时关键，注意两节自修课．属于中档题．

1.He studies English every Wednesday. English is studied by him every Wednesday.
2.He drank a cup of water before sleep last night. A cup of water was drunk by him before sleep last night.
3.Tom got his driving lisence last year. The driving lisence was got by Tom last year.
4.Workers have built some buildings. Some building have been built by the workers.
5.We can finish the homework on time. Homework can be finished on time.
6.Students should solve their own problems. Promblems should be solved by the students themseif.
7.Teachers tell me to obey the school's rule. I am told to obey the rule by my teachers.
8.Teachers don't allow us to be late. We are not allowed to be late .
9.Parents want me to take part in the English competition.
I am wanted to take part in the English competition by my parents.
10.Parents don't allow us to make dicision by ourself. We are not allowed to make our decision by parents.

比较正规的说法应该是：once or twice a month 因为次数只可能是一次或者两次,不可能出现其他情况,且根据习惯说法,不用once to twice,这样说不太地道
每周三至四次：three or four times a week

Coupons will be offered every Monday and Tuesday.Each will be vaild within five days.
General discounts will be offered every Wednesday and Thursday.Each will be between 5% and 15%.
Time limited discounts for two special products will be offered every Friday.Each will be over 20 %.

1、由题意得：英语课2天一次,美术课7天一次,则下次至少要过的天数为2与7的最小公倍数（表达为：[2,7]=14）即14天,即7月28日
2、共过了7次间隔,为（（8-1）*4=28）天,则为8月26日
思路也可理解为两端都植树的植树问题,这总是小学思想吧……

The Internet In my opinion ,the internet is helpful rather than harmful as someone else thinks .As is known to all ,the internet is playing a more and more important part in our daily life . On the internet ,we can read news at home and from abroad ,and get as much information as we can .We can send e-mails or make phone calls to our family as well as to our friends .We can also attend the net school ,read many books and even teach ourselves english .We can also enjoy music ,watch mathes and play computer games on the internet .We can even do shopping online .Besides ,we can improve our ability to operate the computer . But we should not be addicted to the internet or we will get our life and study destroyed .Besides ,we should keep off the harmful websides. Anyhow ,this doesn't prevent the internet becoming our friend. We can't throw away the apple because the core,can we ?

1日,他两次打扫房间日（星期三）.多少次剂量他打扫他的房间在周三吗?
他刷他的牙齿3次day.How的许多倍剂量（多久）他在一天刷牙吗?
3,给植物浇水,每长4 days.how的你给植物浇水吗?
他刮胡子每隔一天/每3天.
5多久剂量的时候,剃头?这是它自己的答案,没有机械的字典翻译,

twice a week
three to four times a week

three times a week

i take dancing lesson，every Wednesday

on every Thursday half past four to half past five

每四年一次用
-> once every four years
每周三次
-> three times every week
看报纸
read the newspape

Let us practise playing the piano every Wednesday

Assuming you is li hua, your American friend letter you in the winter vacation taught her learning Chinese, replying in English for her, content is, time weekly three to five, And site is LiHuaShu square, study content is daily conversation, Chinese song, Chinese festival, etc...

three or four times a week
quiet good
get high mark
who is the most healthy
eat as little meat as possible