S: I first started smoking when I was 15.

T: 他给我一些烈性可卡因。

S: He offered me some crack cocaine.

T: 可卡因是一种强性的使人上瘾的药品。

S: Cocaine is a powerfully addictive drug.

T: Good. Thank you.

Step II Preparation

T: Look at the sentences on the screen please. Pay attention to the underlined word in each sentence. Read them quickly and find out what usage each underlined word belongs to. Here I have provided you some choices.

1. They came to help me.

2. The train is to leave at 7:00.

3. He hurried home only to find his money stolen.

4. He wants me to go.

5. John was the first to arrive.

A: To indicates arrangement.

B: To indicates purpose.

C: To indicates result.

D: To follows certain verbs.

E: To has an adjectival function.

A few minutes later.

T: Have you finished?

S: 1－B; 2－A; 3－C; 4－D; 5－E.

T: Very good!

Step III Grammar 1

Let the Ss do Activity 1. A few minutes later, check the answers.

...

T: From the practice, we can see to has many different uses. But today we'll learn one of them. That is, to indicates purpose. Now read the two sentences in Activity 2. What are the uses of in order to and so as to?