Below you will find various notes and links for your use to learn and master the concepts of Spanish 2. ALSO, BE SURE to look in "Grammar Notes" under "Course Materials" on this website to find many very helpful notes that pertain to Spanish 2 as well as Spanish 1.
Preterite vs. Imperfect - Good video with a story to illustrate when both preterite and imperfect are used in storytelling.
Adjective Placement - This is a bit lengthy, but very good to explain and illustrate where adjectives are placed in a sentence in Spanish.