中级美国英语Lesson27:现在完成进行时态

下面一组练习的内容是说电脑的发展情况. 练习的作法是老师念一个被动语 态的现在完成时态句子,比方 "更好的电脑已经设计出来了." Better computers have been designed. 接着老师念出名词, 也就是动作执行者, 比方 "技师" technicians, 请你用老师给你的名词把原来的句子改为现在完成时态的主动 语态句子, 所以刚才那例子的答案就是: "技师一直在设计更好的电脑. " Technicians have been designing better computers. 这组练习比较难, 所以你要 特别注意. 每作完一句老师会念出正确答案,让你作个比较, 看你作对了没有.

M: Small computers have been made.

M: technicians

F: Technicians have been making small computers.

M: Better computers have been designed.

M: technicians

F: Technicians have been designing better computers.

M: Computer science courses have been studied.

M: many students

F: Many students have been studying computer science courses.

M: Computer science courses have been taken.

M: many students

F: Many students have been taking computer science courses.

M: Home computers have been bought.

M: a lot of people

F: A lot of people have been buying home computers.

M: computers have been used at home.

M: a lot of people

F: A lot of people have been using computers at home.

下面一组练习的作法是老师念一个现在完成进行时态句子, 比方: "人们一直 用电脑来计算复杂的问题. " People have been using computers to compute complex problems.接着老师念出一个词组, 比方: "存放资料" store information, 请你把老师提出的词组代换到原来的句子里,所以答案就是 People have been using computers to store information. 在这一组练习里你可以学到电脑的许多 用途, 比方: "记录生意状况" record business, "与别人沟通" communicate with others, "寄帐单给客户" send bills to customers, "记下存货数量" keep records of inventories, "记录开支数目" keep track of expenses, "开关电动器具" turn appliances on and off 等等. 这些词汇你可能不太熟, 请你作练习的时候特别 注意听, 每作完一句就听老师再把正确答案念一遍.

M: People have been using computers to compute complex problems.

M: store information

F: People have been using computers to store information.

M: record business

F: People have been using computers to record business.

M: communicate with others

F: People have been using computers to communicate with others.

M: send bills to customers

F: People have been using computers to send bills to customers

M: keep records of inventories

F: People have been using computers to keep records of inventories.

M: keep track of expenses

F: People have been using computers to keep track of expenses.

M: turn their appliances on and off

F: People have been using computers to turn their appliances on and off.

下面一组练习是由老师念一个现在时态问句, 比方: Do people use computers for entertainment? 学生就用现在完成进行时态把句子改成 Have people been using computers for entertainment? 这组练习的内容还是说到电脑的用途.作这 组练习一方面可以练习不同时态, 一方面也可以复习刚才学过的词汇.请你在 学生作练习的时候也一起作.

M: Do people use computers for entertainment?

F: Have people been using computers for entertainment?

M: Do people use computers for communication?

F: Have people been using computers for communication?

M: Do people use computers for inventories?

F: Have people been using computers for inventories?

M: Do people use computers for record-keeping?

F: Have people been using computers for record-keeping?

M: Do people use computers to store information?

F: Have people been using computers to store information?

M: Do people use computers to compute complex problems?

F: Have people been using computers to compute complex problems?

M: Do people use computers to send bills to customers?

F: Have people been using computers to send bills to customers?

M: Do people use computers to keep track of expenses?

F: Have people been using computers to keep track of expenses?

M: Do people use computers to turn their appliances on and off?

F: Have people been using computers to turn their appliances on and off?

三.听短文回答问题

今天我们要听一篇关于电脑工业发展迅速的文章.这篇文章里有不少现在完成 进行时态句子, 也有许多我们刚才练习过的词汇.

请你注意听, 等一会儿老师要根据文章问你几个问题.

The home computers industry has been growing rapidly in the United States for the last ten years. Computers used to be large, expensive machines that were very difficult to use.

But scientists and technicians have been making them smaller and cheaper while at the same time they have been made easier to use. As a result, their popularity has been increasing as more people have been buying computers for their homes and businesses.

Computers have been designed to store information and compute complex problems.

Some have voices that speak with the operators. Stores use computers to keep records of their inventories and to send bills to their customers.

Offices use computers to type letters, record business and communicate with other offices.

People have been using computers in their homes to keep track of expenses and turn appliances on and off.

One important new use for computers is for entertainment. Many new games have been designed to be played on the computers. People of all ages have been playing these games. They have been going to Arcades where the computer games can be played for a small cost. People also have been buying home computers to play computer games at home. They have become very popular indeed.

刚才那篇文章你都听懂了吗? 如果没有, 不要着急, 等一会儿你还有机会听. 现 在老师先把今天测验的问题念一遍给你听.

第一个问题是:

M: Why have computers been getting more popular?

第二个问题是:

M: How can computers be used?

第三个问题是:

M: Who has been playing computer games?

现在老师再用慢速度把整篇文章念一遍.

The home computers industry has been growing rapidly in the United States for the last ten years. Computers used to be large, expensive machines that were very difficult to use.

But scientists and technicians have been making them smaller and cheaper while at the same time they have been made easier to use. As a result, their popularity has been increasing as more people have been buying computers for their homes and businesses.

Computers have been designed to store information and compute complex problems.

Some have voices that speak with the operators. Stores use computers to keep records of their inventories and to send bills to their customers.

Offices use computers to type letters, record business and communicate with other offices.

People have been using computers in their homes to keep track of expenses and turn appliances on and off.

One important new use for computers is for entertainment. Many new games have been designed to be played on the computers. People of all ages have been playing these games. They have been going to Arcades where the computer games can be played for a small cost. People also have been buying home computers to play computer games at home. They have become very popular indeed.

现在请你回答下面三个问题. 每回答一个问题就请你听老师念正确答案.

第一个问题是:

M: Why have computers been getting more popular?

F: It is because they are smaller, cheaper and easier to use.

第二个问题是:

M: How can computers be used?

F: They can be used to do any of the ten things mentioned in the reading.

第三个问题是:

M: Who has been playing computer games?

F: People of all ages have been playing computer games.