2 将来进行时: 等同于一般将来时

3 将来完成时: 强调到将来某一点时间动作的结束

4 将来完成进行时: 强调到将来某一点时间动作可能结束或延续

过去完成进行时had been doing

过去完成进行时 : 到过去某一点时间为止动作一直在延续

Eg:His father had dead...

Eg:His father had been waiting for his son until he came back.

soon the astronauts will have repaired the telescope.

宇航员很快会把望远镜修好.

will have done到将来某一点时间, 动作完成

by Friday midday, they will have been working on it for seven days. 到星期五中午, 他们就在这个工程上干了7天了.

work on sth关于......的工作

到将来某一点时间, 动作延续

【Special Difficulties】 难点

Words often confused 经常容易混淆的词

Study these examples:细读以下例子 :

a Nouns: Cost, Price, Value

The Hubble was launched at a cost of over a billion dollars.

哈勃望远镜发射升空, 耗资10多亿美元.

How much is that blouse? Let's ask the price.

这件衬衣多少钱?让我们来问一下价钱.

The stolen items were of sentimental, rather than financial value.

被盗物品更具有情感上的涵义, 而不是经济上的价值.