冀教版九年级英语上册《Planet Danny》Look into Science! PPT精品课件，共21页。
Lead-in
1. Do you know any of the planets in the solar system?
2. What would you like to look at with a telescope?
Read and answer the questions.
1. Why does Danny only see a tiny circle of light?
Because he uses the wrong end.
2. When will they look at stars through the telescope again?
At around 7:00 p.m.
3. What size telescope will Danny use to find a new planet?
Double the size of Danny’s house.
Language points
1.I don’t think you can find one unless you have a bigger telescope.
我认为你不会找到的，除非你有一架更大的望远镜。
unless为连词，意为“除非，如果不”，相当于if…not… ，引导条件状语从句。
当主句是一般将来时态、祈使句或谓语中含有情态动词或主句是一般现在时，从句中要用一般现在时代替一般将来时。
I will be very angry unless you go with me.
=I will be very angry if you don’t go with me.
如果你不和我去, 我会很生气。
You will miss the bus unless you hurry up.
除非你快一点，否则你会误车。
Don’t ask me to explain unless you really don’t understand.
不要叫我解释, 除非你真的不懂。
2. Well, it’s worth a try, even if I don’t find a planet.
嗯，那仍值得一试，即使我没有发现一颗行星。
（1） worth 形容词，意为“值得”，
be worth doing sth. 值得做某事。
The clock is worth ten dollars.这个钟表价值10美元。
Is it worth running such a risk? 这样冒险值得吗？
（2）even if 意为“即使；纵然” （= even though），引导让步状语从句。
He will come on time even if it rains.
即使下雨他也会按时来。
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