First of all, pay attention to manners, then write down the slogan you want to write in your mind, and finally add, thank you for your cooperation. When writing the slogan of knocking at the door, first pay attention to politeness, and then write down the slogan to be written, for example, you can write it in front of the door, hello, I am good, everyone is good, and finally add, thank you for your cooperation. Writing this sentence can show respect for others. Other slogans of knocking at the door are closing the door gently and being warm; Please knock on the door gently if there is a lovely baby at home; Please knock on the door slowly when studying.