You can look at the following table first to understand the harm and harm:
The difference between doe harm for and do harm to: Difference 1: Usage Object doe harm for: This phrase is usually used to mean to cause harm or bad influence to the whole, the group or a wider range of things. The government's new policy will do harm to the economy. These new policies of the government may hurt the economy. )
Ex. 2: Some chemicals in the air will harm people's health. Some chemicals in the air may be harmful to people's health. )
This phrase is usually used to mean to cause harm or damage to a specific person, object or thing. The earthquake caused serious damage to the buildings in this city. )
Ex. 2: Excessive use of pesticides will do harm to the environment. )
Difference 2: grammatical structure doll again for: this phrase is usually followed directly by a noun or noun phrase, indicating harmful behavior to something or someone. He didn't mean to hurt anyone. )
Her behavior may damage the reputation of the company. )
This phrase is usually followed by a noun, a pronoun, a -ing of a verb or the objective form of a pronoun, indicating harmful behavior to a specific object. This virus will damage your immune system. )
Example 2: Bullying will do harm to young people's mental health. Bullying may do harm to the mental health of teenagers. )
Difference 3: action intensity do harm for: this phrase is relatively light in action intensity and emphasizes the possible negative impact. Skipping breakfast may affect your work efficiency. )
His sarcastic remarks hurt her feelings. His sarcastic remarks may have hurt her feelings. )
This phrase has a strong tone, emphasizing the harm that has actually been done. The accident damaged the engine of the car. )
Excessive drinking will damage your liver. )
Difference 4: semantic harm: this phrase is sometimes used to express meaningful behavior. Although it may be harmful, its main purpose is to achieve a certain purpose. Example 1: The government thinks that this policy may be harmful to some enterprises, but it is necessary for environmental protection. )
He risked being punished and openly opposed justice. He risked his reputation to speak out against injustice. )
Harmful to: This phrase emphasizes the negative influence of behavior, and often does not emphasize the realization of other goals. Example 1: Gossiping about others will do harm to interpersonal relationships. Gossiping about others may damage our relationship. )
Ex. 2: Overexploitation of natural resources will do harm to the ecosystem. Overexploitation of natural resources may be harmful to the ecosystem. )