2) Idioms are an important part of language and they are used in everything from literature to films and newspapers.
3) Would you like to hand in another paper or shall I give you an F? 4) The day breaks, for the birds are singing. 5) He studied hard, thus, he got high marks. 6) Think it over and you will find a way out.
7) Not only is this problem very important but also it is difficult to solve. [Explanation]
并列句运用：让学生把两个简单句连成一个并列句。
Step 4 Complex sentences
1. Compare the following two sentences and tell the structures of them. [PPT17]
1) An idiom is a group of words or an expression and the meaning of the expression often cannot be understood by looking at the meanings of the separate words in it.
2) An idiom is a group of words or an expression whose meaning often cannot be understood by looking at the meanings of the separate words in it.
(The Ss may list the structure of the first one: subject + predicate + and + subject + predicate. As to the second sentence, the Ss may have difficulty.)
Teacher can help the Ss to find that “whose meaning often cannot be understood by looking at the meanings of the separate words in it” serves as an attribute of the word ‘expression’.
Look at more examples: [PPT18]
1) Unless you recognize when an idiom is being used, it is easy to misunderstand what you read or hear spoken. (Underlined part serves as the adverbial.)
2) There are lots of examples of idioms where animals are used to create an image. (Underlined part serves as the attribute.)
3) This means that since the Bible was translated into English centuries ago, many Hebrew or
Greek idioms have become part of the English language. (Underlined part serves as the object.)
4) An idiom is a combination of words, whose meaning often cannot be understood by looking separately at the meanings of the words that make it up (Underlined part serves as the attribute.)
A sentence used as the subject, object, attribute, adverbial or appositive of another sentence (main clause) is called a ‘subordinate clause’. A complex sentence is made up of a main clause and one or more subordinate clause. They are linked by subordinators such as because, when, where, if, since, that, unless, whereas, whose, while, although, etc. The complex sentence structure: main clause +subordinate clause [PPT20]
（一个句子充当另一个句子的组成部分，如主语、宾语、定语、状语、同位语等，这样结构的句子叫主从复合句。充当某一成分的叫从句subordinate clause，带有从句的句子叫主句main clause。主句和从句由从属连词subordinator连接。）
[Explanation]
复合句概念
2. Activity: Find complex sentences from the text. [PPT21]
Divide the students into groups of four and hold a competition to see which group can find the most complex sentences in 2 minutes. (The group can divide the text into 4 parts and each member search in one part to speed up.) [Explanation]
复合句辨认：找出课文中的复合句
Step 5 Complex-compound sentences
1. Study the following sentence and try to work out its structure. [PPT22] We have tried to train the young people who were hired last month, subordination