Guideline to introduce the simple past tense of the verb to be
收藏Mendeley Data2026-04-09 收录
下载链接：
https://data.mendeley.com/datasets/f8wdmjc74v
下载链接
链接失效反馈官方服务：
资源简介：
This guideline explains how to teach the affirmative, negative and interrogative structures of the simple past tense of the verb to be.
