It is not an easy task for EFL learners to make the distinction between a main verb in its past tense and its past participle in a sentence, especially if their forms are identical (e.g., I am pleased that the news pleased them). Inspired by the linguistic phenomenon that the only one main verb can carry tense within a sentence, I created a story of the VERB family.
(Synopsis) A battle arose within the verb kingdom for the owner position of a sentence. The royal verb that won the war had tense as a sign of victory. They had a superpower to control time within the kingdom. The losers put special markings on them (e.g., -ing, -ed, to-) to hide their identities and serve as various roles in a sentence.
My 8th graders really loved this story-based grammar instruction. Being immersed in the story, they were able to learn the English verb system naturally (while having a lot of fun). I am thinking of expanding the story line to include more diverse aspects of the English language. If you have good storyline with Marvel characters intertwined with aspects of the English language, please let me know!