What are the concepts of object clause and slogan clause?

An object clause is an explanation or modification of the object of the main clause. Predicate string sentence is an explanation or modification restriction to the predicate of the main sentence. The functions of these two kinds of cluster sentences are similar, but the components of the affected people in the sentences are different. Examples are as follows: A. I have a beautiful hat, which is a birthday present from my sister. The object of the main clause is hat, and which ... is an object clause, which modifies the restrictive hat. So this sentence can be understood as: I have a beautiful hat, (what kind of hat? This is a birthday present from my sister. It's soft and comfortable to touch. In this sentence, the sentence component of soft is predicative, and touched ... is predicative, which plays an auxiliary role. So this sentence can be understood as follows: this thing is very soft, (how soft? ) I feel very comfortable.