请设计一节课的教案，达到以下目的：
1．学生能够正确搭配否定前缀dis-，im-，un-，non-；
2．培养学生区分两种定语从句的能力。

A. he is forced to do things
B. be cannot work at his best
C. he feels his brain shut down
D. he thinks his work is too heavy

A. Using too much packaging.
B. Recycling too many wastes.
C. Making more products than necessary.
D. Having more material than is needed.