сложность в том, что я не понимаю в каких случаях ставить present perfect, а в каких past simple

1. spectacle, which was watched by me at last time, is named "shoes for cinderella". this is a musician fairytale for children. 2. this is a beautiful story about girl, which wanted to be on the ball. very harmfully not go to the ball, when you really deserve this. and happiness came to cinderella! came suddenly, unexpectedly! the most beautiful dress, crystal shoes, dance with prince in round of world stars. really star ball with the world celebrity! 3. what need to talk about idea, very interesting, but not very long and boring beginning. i wasn't addicted for idea, all was very predictable. 4. i was impressed by the decorations very much. they was so big and bright, that i couldn't take eyes from them. especially i was addicted by huge clock and coach. 5. the main characters are: cinderella, her stepmother and her two daughters, and also, prince.