1.week的意思是“星期”,可指星期日到星期六的七天,也可指从任何时候算起的连续七天,还可指包括某一特定的一周,举行某种庆祝之周等。
2.“两星期”的表示方法英式英语用fortnight,而美式英语用two weeks。
3.Monday〔Tuesday〕 week指从本星期一〔星期二〕算起的前一个或后一个星期一〔星期二〕。
4.this day week指从某日起算七天前或七天后的一天。
5.tomorrow week指一星期后的明天, yesterday week指一星期前的昨天。the week of the 22nd指从22号开始的一星期。

He has calculated the day of the week on which Christmas will fall.他推算出圣诞节该是星期几。
After a couple of weeks, almost all the infected plants bore cotton bolls.一两个星期之后几乎所有有病的棉花都结桃了。
I bathed in the public baths nearby twice a week.我曾在附近的公共浴池一周洗两次澡。
An oil tanker caught fire and burned for a week.一艘油轮着火了,燃烧了一星期。
They advanced the price of gasoline twice in a week.在一个星期内他们两次提高汽油价格。
The Adamses asked the Russells to dinner and a week later the Russells asked back the Adamses.亚当斯家请拉塞尔家吃饭,一周后拉塞尔家回请亚当斯家。
We've arranged that the kids should go and help her once a week.我们安排好让孩子们一星期去帮她一次忙。
He allowed his children fifteen pence a week.他给他的孩子们每星期15个便士。
We may continue the traction up to three weeks, until the fracture is healed.我们可以继续牵引三周,直到骨折痊愈为止。
She spent six weeks catching up with her studies.她花了六个星期赶功课。
He has been barred from playing for two weeks because of bad behaviour.他因行为失于检点而被禁赛两周。
The town was thoroughly billed by advance agents of the circus last week.上星期这个镇被马戏团的先遣人员贴满了海报。
This day week a new play was acted.上星期的今天演了一出新戏。
He will come this day week.他下周的今天会来。
There wasn't time to finish all the games last night and so some have had to be carried over until Tuesday week.昨晚没有时间结束所有的比赛,因此有些比赛只得推迟到下周二进行。
He writes to us every week to catch us up on what's happening in the countryside.他每星期给我们写信,把农村里的最新消息告诉我们。
The trade union bargained that its members should have another week's holidays.工会要求所属会员应再休假一星期。
In the week, we got up at seven.平时我们七点钟起床。

下面两句话的意思相同：
She has been advertising for a cleaner
for weeks without success.
She has been advertising for a cleaner
in weeks without success.
近几周她接连登广告想雇一名清洁
工,但至今没有找到人。

［词源］  ＜古英语wicu(星期)