Before watching the video and clicking on the material links of this Spanish Preterite Subjunctive class you need to read first this blog post. Once you get the grammar then you come have an idea of the rest of the uses which are the following:
Diligent student being absorbed in studying
- Spanish Preterite Subjunctive on unrealistic situations with the structures (Ni Aunque, si, Como si, Ojala)
- Structures that trigger the subjunctive from this file in the past tense + Spanish Preterite Subjunctive
- Structures that trigger the subjunctive from the same file in the present tense + Spanish Preterite Subjunct
Materials
https://docs.google.com/presentation/d/1WGxpK85fW0SIpNIAiKNseJK-CD3jixnCDSW_biXqTSk/edit?usp=sharing
https://docs.google.com/document/d/1rpnfumjP2SXvcBlgYSVwJPgbkkd5tDn_Fs0sFgBVmOU/edit?usp=sharing