objectives: 1. instructional aims
（2）let students know the grammatical rules of infinitives.
（3）build students’ ability of differing different types and usages of infinitives.
（4）improve students’ ability of using infinitive to express themselves if necessary.
2. educational aims
1.) after the study of infinitives students should have some clear knowledge of infinitives and know how to use them to express them.
2.) let students find out some important rules in the infinitives.
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