3.　　　　 protect the environment

2.　　　　 ought (not) to do sth.

1.　　　　 had better do sth. / had better not do sth.

2.　　　 Some other exercises.

第六课时： Grammar　 (2)

1.　　　 Finish off the exercises in the exercise book.

10.　　plete the dialogue and check the answers.

Homework:

9.　　　　 Tell the students the negative and the question forms.

8.　　　　 A3.Fill in the blanks . The students work alone.

7.　　　　 A2.Write out the past participle of the words.

6.　　　　 Explain words and phrases students don’t understand.