12.2 the present perfect continuous and the present perfect simple
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- 13 过去完成时 The past perfect simple6908:30
- 12.2 the present perfect continuous and the present perfect simple9712:45
- 12 现在完成进行时 The present perfect continuous7509:03
- 11.5 现在完成时和过去时 the present perfect simple and the past simple6911:48
- 11.4 gone和been gone and been7608:42
- 11.2 规则过去分词 regular past participles8705:25
- 11 现在完成时 the present perfect simple10212:57
- 10.2 过去进行用于场景设定 the past continuous for scene-setting9610:15
- 10 过去进行 the past continuous10711:03
- 9.2 用be的一般过去时疑问句 questions in the past simple with be9512:27
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