Hello egf. The below is my answer for you, hoping it will help you somehow. 1.Korean verb conjugations. Like, I know 'ㅂ 니 다/ 습 니 다' and '세 요' etc, but you can't end every sentence with those conjugations. With respect to 'ㅂ니다', there are some forms like 합니다, 입니다, 습니다. ~세요? is usually used when asking someone what they do. ~세요. is a the word comes at the end of sentence when ordering or commanding someone to do something. And yes. There are also many other forms which don't contain the words at the end. 2.I want to know different verb conjugations and particles. This question is too broad to answer. Perhaps learning many Korean words and searching some words on Google will work effectively to help you get the hang of those forms. 3.Also, I would liked to know more complex sentence structures instead of just 'Subject - object verb' Again, you should learn vocabulary as well as grammar. It will be difficult to understand those broad range of structures without knowing which words is used in which structure. Vocabulary is important as same as grammar.