Why do many people like to repeat the same sentence several times?

There are several kinds: the first is that you have a bad memory (for example, parents and elders care about you and tell you over and over again); The second is that he has a bad memory and can't remember where he said; The third is that you often interrupt him when you talk to him. If you don't want to listen, he has to repeat it. The fourth is that he can't find a topic when talking to you, and you need to find a topic to fundamentally avoid his verbosity; If this is not the case, it means that this person has a brain problem and a mental problem. Didn't you see those mental patients say the same thing over and over again? Sister Xianglin is mentally ill. Whenever she meets someone, she talks about how hard her life is. She shouldn't leave her son outside, so whenever she sees other people's children, she says that her children are so old. And, like the owner of Xianheng Hotel, I didn't see Kong Yiji and thought about his money for two bowls of wine. Every time I say, "Kong Yiji has been here for a long time, and Kong Yiji has been here for a long time ...".