There are many specific techniques to correct a wrong sentence. You can refer to the following suggestions: 1. Decide on the type of sentence: For example, grammar errors, improper use of words, logical errors, etc. 2. Decide on the mistakes to be corrected, such as missing words, repetition, improper matching, etc. 3. Decide on the method of modification: For example, directly modify the sentence structure, replace words, adjust the sentence order, etc. 4. Decide on the extent of modification: For example, only one word in the sentence, all of it, or basic modification. For example: He is very down today. He was very unhappy today. He was very depressed today. He was in a bad mood today. [Degree of modification: The basic modification only changed one word in the sentence.] In addition, it was also important to modify the wrong sentence according to the context and the meaning of the sentence.