==================资料简介======================
Teaching aims:
1. To go over the words and phrases.
2. To go over the grammar items.
Teaching importance:
1.the words and phrases.
2 the grammar
Teaching difficulties:
1.To compare the usage of objecct clauses introduced by "if"with the usage of adverbial clauses introduced by "if"
2.Tense of objecct clauses introduced by "that""if"or "whether"
Teaching aids:
Preparation and test paper.
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