Change-of-state le 了 used in sentences with different predicates

1. le 了 at the end of a sentence with a noun predicate.
2. le 了 at the end of a sentence with a stative verb predicate.
3. le 了 at the end of a sentence with a verb predicate.
4. le 了 at the end of a sentence with a verb predicate in which an optative or modal verb occur before the main verb.
5. le 了 at the end of a shì 是 sentence.
6. le 了 at the end of a yǒu 有 sentence.