13.2 现在完成时和过去完成时 THE PRESENT PERFECT AND PAST PERFECT

14 过去完成进行时 The past perfect continuous

13 过去完成时 The past perfect simple

12.2 the present perfect continuous and the present perfect simple

12 现在完成进行时 The present perfect continuous

11.5 现在完成时和过去时 the present perfect simple and the past simple

11.4 gone和been gone and been

11.2 规则过去分词 regular past participles

11 现在完成时 the present perfect simple

10.2 过去进行用于场景设定 the past continuous for scene-setting