您正在看的高中二年级是:Saving the earth。 或此刻前一直在进行的动作。

　　You must be joking.你一定是在开玩笑吧。

　　Philip thought Ross must be looking forward to his return.

　　They must have been enjoying themselves.

　　▲用must be表示推测时，反意问句要用be的适当形式，不用must。例：

　　It must be Xiao Wang, isn’t it?

　　They must be new students, aren’t they?他们一定是新生，是吗?

　　▲ 当must+完成式表示推测时，反意问句要用have 或 has。例：

　　You must have seen the film,haven’t you?

　　He must have been to the Great Wall,hasn’t he?他一定去过长城，是吗?

　　【注】但如果句中有明确的表示过去的时间状语时，反意问句要用did。例：

　　He must have gone to Shanghai yesterday, didn’t he?

　　She must have attended the meeting yesterday evening, didn’t she?她昨晚一定参加了会议，是吗?

　　▲ 表示“某处的入口处”，entrance后接介词to一般不用of，类似的词还有：

　　key to the door

　　answer to the question

　　wire to the starter

　　22. Three of us walked back about one kilometer and found Sun Yao. He was busy measuring a plant and taking photographs of it.我们中有三人往回走了一公里发现了孙尧。他正忙着给一棵植物量尺寸，拍照片。

　　▲ 表示“忙于做某事”，用be busy doing sth.。例：

　　She was busy writing out sums upon the blackboard.

　　Dr. Bethune was busy operating on the wounded soldiers.白求恩大夫忙着给伤员动手术。

　　▲ be busy后可以跟介词短语，常见的介词有at,about,over,with等。例：

　　What have you been busy about today?

　　He was busy day and night with conferences.

　　He pretended to be suddenly busy with some work.

　　Today I have been busy over your book.今天我一直忙着看你的书。

　　▲ Busy也可以作动词用，意为“使自己忙于……”。例：

　　Afterwards, she began to busy herself with some sewing beside the fire.

　　Smith pretends to busy himself writing.他假装忙着写作。

　　To forget his trouble,he busied himself with answering letters.

　　▲ Busy有时作“热闹，来往的人很多”解释。例：

　　The shops are very busy before Christmas.

　　This is one of the busiest underground stations on London.

　　Our guide then took us into the busy part of the city.

　　23. Pointing to the young plant,he asked me if that was the type of plant we had seen in the film.

　　▲ 这是一个复合句，if引导的是一个宾语从句，在宾语从句中又包含一个定语从句， we had seen in the film修饰 plant，省去了关系代词that，句首的是一个分词短语做状语，表示一个伴随动作。现在分词在句中作伴随状语很常见。例如：

　　He came running and shouting.他边跑边喊着跑了过来。

　　The old man sat by the window,staring and thinking.

　　▲现在分词做状语时还可以表示时间，原因，条件，结果，行为方式等。例：

　　Passing by the house,he saw a girl playing the piano.他经过那房子时，看见一个女孩在弹钢琴。

　　Being ill,he couldn’t attend the meeting.他因病不能参加会议。

　　Turning to the left, you’ll find a bookstore.向左转，你会看到一个书店。

　　His father died, leaving him nothing.他父亲去世了，什么也没留下。

　　▲ 现在分词做状语时，其逻辑主语即是句子的主语。但有些分词短语成为习惯用语，用来修饰整个句子。如：generally speaking一般说来, strictly speaking严格说来, judging from从……判断,considering everything把一切考虑在内。例：

　　Frankly speaking,Idn’t like the book.坦率的说，我不喜欢这书。

　　Considering everything,it is worth trying.通盘考虑，值得一试。

　　Judging from her face,she must be ill.从脸色看，她一定病了。

　　24. To my joy,the plant did look exactly like what we were looking for.All of us felt very happy.使我们高兴的是，这种植物跟我们要找的那种确实是一模一样，我们都感到非常高兴。

　　▲ to one’s joy, 意为“使人高兴的是”，类似的结构还有to one’s surprise,使人惊奇的是to one’s sorrow, 使人悲伤的是to one’s relief使人欣慰的是。例：

　　To her great joy,she found her lost necklace.使她高兴的是，她找到了丢失的项链。

　　To the surprise of all the teachers present, the little girl spoke very good English. 使所有在场老师惊奇的是，这个女孩英语讲的很好。

　　To her parents’ relief, she passed the college entrance examination. 使她父母欣慰的是，她通过了高考。

　　Language record

　　In this unit I have learned to say in English:

　　Useful EXPressions:

　　对世界造成的破坏 立足之地

　　(世界)适合于我们居住 尤其注意……

　　限制牲畜的头数 使…保留在原来的

　　濒危的动物 一个保守得很好的秘密

　　Sentences:

　　1. 假如我们吃了被污染的水果，我们会生病。

　　2. 这种鱼不宜于食用。

　　3.许多人死于这次事故引起的疾病。

　　4.受伤人员中有许多人双目失明。

　　5.这是历史上最严重的事故之一。