The past continuous tense refers to actions that continued for a period of time, as in the sentence "she was walking," which describes an action that was still happening in a prior window of time to which a speaker is presently referring. The past perfect tense is used to describe actions that were already completed by a specific point in the past.
past (past, päst), adj. gone by or elapsed in time: It was a bad time, but it's all past now. of, having existed in, or having occurred during a time previous to the present; bygone: the past glories of the Incas. gone by just before the present time; just passed: during the past year. ago: six days past. having formerly been or served as; previous; earlier: three past presidents of the club ...
past (plural pasts) The period of time that has already happened, in contrast to the present and the future. quotations a book about a time machine that can transport people back into the past
Learn about the different past tense forms (past simple, past continuous and past perfect) and do the exercises to practise using them.
- One possible explanation of the high degree of order in the present-day world is that it is just a question of luck. 对 今天 世界 之所以 高度 有序 的 一个 可能 解释 是， 这 恰恰 是 一种 侥幸。
- of swarm since if it is not present, then it is maybe impossible for the swarm to achieve any other group objective. 稳定性 是 群集 行为 的 基本 特性， 如果 群集 不 稳定， 那么 群集 不可能 达到 或 完成 各种 集体 目标 或者 任务。