1. The first thing I did was to see if there were any products that might help me, but there only seemed to be powders designed to kill snakes.

2. Between the outside and the inside walls of the bowl there is some jelly, which freezes hard when cooled.

3. Nor will you receive a patent until a search has been made to find out that your product really is different from everybody else's.

Sample answers:

1. 我做的第一件事是看看是否有能帮我忙的产品，但是好像只有一些用来捕杀蛇的粉末。

2. 在碗内外侧有一些果子冻，当冷却时它们会冻得很结实。

3. 直到做了一次调查后发现你的产品确实与众不同，这时你才会获得专利。

Step Ⅱ Grammar focus

T: Now, please look carefully at some examples on the slides and answer some questions below:

Show the following.

1. The Titanic is a sunk ship in the ocean.

2. The book intended as a surprise to him was lost in the mail.

3. He seems moved to tears by the film.

4. If bitten by a snake, you should call for help.

5. We left them caught in the storm.

Qs:

1. What's the function of the words in bold?

2. What kind of voice do they have? Why?

3. What part of speech does each of them have?

4. What's the difference between the structures of the first two sentences? Can you rewrite them in the attributive clause?

T: Now, please talk with your partner and then we will deal with the questions one by one.

S1: All the words in bold in the sentences are all past participles, which explain and add more information to the meanings of the sentences.

S2: Usually the past participle shows the passive voice to the related part of the sentence. For example in the first two sentences, the verbs sunk and intended indicate the passive relationship to the nouns they modify ship and book while in the third and the fourth sentences the passive relationship is between the subject He and moved; you and bitten. From the last sentence, we know they were caught in the storm.

S3: The past participles act as attribute as in the first two examples while they serve as predicative, adverbial, object complement respectively in the next three examples.

S4: The past participle in the first sentence modifies the noun following it while in the second sentence the modified noun is in front of the past participle. They can be rewritten as The Titanic is a ship which is sunk in the ocean. The book which was intended as a surprise to him was lost in the mail.

Step Ⅲ Discovering useful structures

T: First I'd like you to look at the example and talk about the part of speech of the