复习将来进行时「13课」、by引导的时间状语从句。
课文
Trouble with the Hubble「哈勃望远镜的困境」
The Hubble telescope was launched into space by NASA on April 20,1990 at a cost of over a billion dollars. Right from the start there was trouble with the Hubble. The pictures it sent us were very disappointing because its main mirror was faulty! NASA is now going to put the telescope right, so it will soon be sending up four astronauts to repair it. The shuttle Endeavour will be taking the astronauts to the Hubble. A robot-arm from the Endeavour will grab the telescope and hold it while the astronauts make the necessary repairs. Of course, the Hubble is above the earth’s atmosphere, so it will soon be sending us the clearest pictures of the stars and distant galaxies that we have ever seen. The Hubble will tell us a great deal about the age and size of the universe. By the time you read this, the Hubble’s eagle eye will have sent us thousands and thousands of wonderful pictures.
译：
哈勃望远镜于1990年4月20日由国家航空航天局发射升空，耗资10多亿美元。从最开始哈勃望远镜就有问题。它传送给我们的图像很令人失望，因为它的主要镜子有误差。国家航天局准备纠正这一错误，为此将把4名宇航员送入太空修复望远镜。“奋进”号航天飞机将把宇航员送上哈勃。当宇航员进行必要的修复工作时，“奋进”号上的一只机器手将抓住望远镜并托住它。当然，哈勃位于地球的大气层之外，因此，它很快就会给我们传送我们所见到过的、有关行星和远距离星系的最清晰的照片。哈勃将告诉我们有关宇宙的年龄和大小的许多事情。等到你读到这篇文章时，敏锐的哈勃望远镜已经为我们送来了成千上万张精彩的照片。
词
space：**n.空间**outer ~「外太空」
There is no ~ in my room.「剩余空间」
fault「n.错误，故障」
shuttle：**n.航天飞机，往返班车、班机** atmosphere：**n.大气层，气氛** distant：**adj.遥远的**distance「n.距离」
同形：
different「adj.不同的」 difference「n.不同」
important「adj.重要的」 importance「n.重要性」
significant「adj.重要的」 significance「n.重要性」
convenient「adj.方便的」 convenience「n.方便，便利」
句子
重要开头语
I have not heard form you for some time, so…「我有一段时间没听到你的消息了，所以…」
It was very kind of you to…「你去做…真是太棒了」
课文
1.at a cost of over a billion dollars.
at a cost of「造价为…，耗资」
2.Right from the start there was trouble with the Hubble.
There be + n. + 介词短语「介词短语表示位置」
There is a girl in the classroom.
There are problems in front of us.
3.The pictures it sent us were very disappointing because its main mirror was faulty!<\b>
it sent up「定语从句」
n + 从句「定语从句(无关系词，同位语从句有关系词)」
分析长难句：
找谓语动词
找标点、连接词、关键词、分析主谓
4.A robot-arm from the Endeavour will grab the telescope and hold it while the astronauts make the necessary repairs.
and hold it「并列词相同的可以省略，hold前省略了will」
while the astronauts make the necessary repairs.「时间/条件状语从句中一般现在时表将来」
5.By the time you read this, the Hubble’s eagle eye will have sent us thousands and thousands of wonderful pictures.
by + 时间「截止到…时间」，与完成时连用，具体看跟的时间
by the time + 句子，引导时间状语从句
by the time you read this，时间状语从句中，一般现在时表将来，所以后跟将来完成时
结论：by the time + 句子(一般现在时)「截止到将来」，与将来完成时连用
或：by + 将来时间(如 next year)与将来完成时连用
错题
选择
1.My train arrives in New York at eight o’clock tonight. The plane I would like to take from there ____ by then.
A. would leave
B. will have left
C. has left
D. had left
一般现在时跟具体时间一般表将来，by then「到那时」，跟将来完成时，故选B。
2.The pictures the Hubble sent us were ____.
A. wonderful
B. unsatisfactory
C. the clearest
D. disappointed
根据课文形容照片质量差，排除A「极好的」,C「最清晰的」，D「感到失望的，形容人」，故选B「不令人满意的」
3.The main mirror of the Hublle ____.
A. had probelms
B. was dstant
C. was the clearest
D. requires repairs
主语是物时，应该是There were problems with…，不应A「有问题」，B「远距离」不合，C「最清晰的」不指镜子，而是图片，故选D「需要修理」
4.The Hubble is ____ the earth’s atmosphere.
A.below
B.over
C.within
D.outside
A「在…下」，B「在…正上方」，C「在…内部」，D「在…外部」，选D