英语选修6译林牛津版unit 2同步练习（01）及答案 unit 2 同步练习 grammar and usage past tense （过去时态） i. the simple past tense: 一般过去式，谓语用过去式(-ed) it is often used to talk about something that happened in the past and is now finished. e.g. she worked late into night yesterday. ii. the past continuous tense: 过去进行时 (was/were+doing)
