老师：Hello everyone, welcome to this lesson. Today we are going to learn book 1, Unit 5, into the wild, lesson 2, using language attributive clauses to. Before we start, let's look at the objectives of this class. By the end of this class, you will be able to summarize the usages of when, where, why, introducing attributive clauses by finding, comparing and analyzing.
老师：Use attributive clauses introduced by when, where, why in the situation given. Use attributive clauses introduced by when, where, why to describe a lovely animal. First of all, let's review the reading passage, the Monux journey. Please retell the passage we Learned in the last lesson. Who like to have a try? Good, that's welcome. Student a.
学生：The North America monarch butterfly has one of the most wonderful migrations in nature. Every autumn, they make a long journey to California or Mexico. The monarch is able to tell the time of day and uses its eyes to measure the position of the sun. These two pieces of information allow them to determine the way to go. Therefore, they can reach the places they wanted. However, they are in serious trouble. The population of them has crashed a lot because people cut down trees and use chemicals that kill the plants that mock knock caterpillars eat. The natural environment is destroyed. Luckily, people have been working together to record their migration and make sure that there are enough plants for them to feed on.
老师：Well done. I think you have done a very good job. Now it's time to begin our grammar part 1st, please read the passage and. find out all the attributive classes。 If you have got the attributive clauses from the passage, let's read the three sentences in Activity 1 on page 53 and answer the question, what do, where, when and why refer to in each sentence? Okay, time is up. Let me check answers. Sentence a, eventually it manages to reach the places where it will spend the winter. Here the word where refer to the places.
老师：句意，最终，黑麦金班蝶成功抵达过冬的地点。从句部分， where it will spend the winter。主谓宾结构完整，所以关系副词 where 在从句中作地点。状语， sentence b the solution to the mystery of the monarchs amazing ability comes at a time then it is in serious trouble the words， then refers to a time。句意，黑麦金班蝶这一惊人能力的奥秘被揭开时，这一生物正处于水深火热的生存状态中。从句部分， when it is in serious trouble。主系表结构完整，所以关系副词 when 在从句中做时间。
老师：状语， sentence c suddenly human activity is the main reason why the number of monic butterflies is falling the word y refers to the main reason。句意不幸的是，人类活动是造成其数量下降的主要原因。从句部分， why the number of monoc butterflies is falling？主谓结构完整，所以关系副词 y 在从句中作元音状语。
老师：then please find out the differences between the two groups of sentences in activity， one on page fifty three and answer the question why does the author choose to use sentences a， b and c in the reading passage。
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