As liao, 了 has some specific phrase, you can remember: 了解，一目了然，了结，不得了，没完没了，了不得，（看，做，听，跑..）不了。 If 了 is next with a verb, mostly, it should be "le"，and it always should be put at the end of a sentence.

don't worry about that, even chinese people can't use these three words correctly every time. As I know, “的”should be more popular. It can be used to link adjective and noun. And if you can't sure which one you could use, "的" is the safest choice. As new Chinese grammar, that's ok. As to “得”and "地”, these two word particularly be used to describe verb. The difference between them is the position. adverb + 地 + verb verb + 得 + adverb.

Good complain!

Norman, you will be fine, I believe. If I have a chance to know when I will die. I will let my parents and my sister know what will happen in advance, and I will tell them I really enjoy my life in this family and hope they can bless my leave. I think we will meet again. Though I really afraid of death, I think I will be fine on that moment. Everything will be fine. I believe.

Chinese Taiwan is better, I think.