We're sorry, but "English tenses, uses, adverbs, and all I have to know about that" is almost a whole course - it's not something that anyone can answer in the space of a small pink box a few centimetres across!
We don't know what your particular problems are, and you have asked FAR too big a question here.
Please come back with some specific questions - perhaps about the difference between a sentence in one tense and a sentence in another tense - and we'll do our best to help you.