专题10：现在完成进行时-歌曲（音频+视频）+讲解+练习（含答案）唱15首歌搞定英语15种时态用法
微课公开课视频，课件资料预览由于格式无法统一，没办法做到预览全部展示，请见谅！
10 Present Perfect Progressive Tense 现在完成进行时 Judy and Jake are best friends. 朱迪和杰克是最好的朋友。 They have been spending time together since their childhood. 他们从小就已经在一起玩耍了（直到现在）。 Every morning,they get dressed and walk to school. 每天早上，他们都会穿好衣服，一起走路去上学。 They have been walking together to school every mornin...
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