Alcoholism can affect different individuals in different ways, but some common behaviors of an alcoholic may include:

Cravings: Alcoholics may experience strong cravings for alcohol that can be difficult to resist.
Dependence: Alcoholics may develop a physical and/or psychological dependence on alcohol, making it difficult to function normally without it.
Tolerance: Alcoholics may develop a tolerance to alcohol, requiring more and more alcohol to achieve the desired effect.
Withdrawal symptoms: When an alcoholic stops drinking, they may experience withdrawal symptoms such as tremors, anxiety, sweating, and nausea.
Difficulty controlling drinking: Alcoholics may have difficulty controlling their drinking, often drinking more than they intended or for longer periods than they intended.
Neglecting responsibilities: Alcoholics may neglect their responsibilities at work, school, or home in order to drink.
Continued drinking despite negative consequences: Alcoholics may continue to drink despite negative consequences such as relationship problems, health problems, or legal problems.

It is important to note that not all individuals who drink heavily are alcoholics, and not all alcoholics exhibit all of these behaviors. Additionally, alcoholism is a treatable condition, and seeking professional help can be the first step towards recovery.