必修1objective To use the Present Perfect and Past Simple tenses appropriately.语法讲解建议采用归纳法，如尽 可能多的呈现一些相关例句，或 可让学生从已学课文中找相应例 句，引导学生试着从所观察到的 语言现象中总结出语法规律。1. Since then, she has won Wimbledon and the US Open twice. 2. Has tennis ever caused problems between the sisters? 3. The sisters father, Richard, started to train Venus and Serena when they were young children. 4. The first time Venus played in a big event was in 1996. has won Has caused started playedto test your sense of observation to test you
