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Grammar
1. To understand the differences between the simple past tense and the present perfect tense.2. To grasp the expressions with the present perfect tense.3. To grasp the expressions with the simple past tense.4. To understand different uses of the present perfect tense.
Learning targets
  完成句子。1. 北京因万里长城而著名。  Beijing _____________ the Great Wall.2. 这条河是个钓鱼的好地方。  This river is a _______________ fishing.3. 我三天前听说过这件事。  I _________ this _______________.4.自从2000年起，他就在上海工作了。  He __ ...