The prepositions Can you help me? I need the principal prepositions for formulate better the phrases. Can you give me kindly? You 'd be a big help Thanks!!!

Il polpo Some day ago , I was at the sea and I wanted to climb on a rock. When at sudden i see a orange thing holding on my foot . I see better and I realize that is an octopus. I was surprise right after it is disappeared in water. It was wonderful, i don't knew were some octopus in sea near at the my city . This day was wonderful