1. Time:
* After something else: "We ate dinner, then went to the movies."
* Next in a sequence: "First, you mix the ingredients. Then, you bake the cake."
* At that time: "I was young then, but now I understand."
2. Consequence:
* As a result: "The storm knocked out the power, then the lights went out."
* Therefore: "You didn't study, then you can't expect to pass the test."
3. Emphasis:
* To emphasize something: "I know you're busy, then take a break."
4. In contrast:
* Showing a difference: "Some people like coffee, then others prefer tea."
5. Used with "if":
* To express a condition: "If you want to go, then we should leave now."
Examples:
* Time: "I went to the store, then I came home."
* Consequence: "She forgot her phone, then she couldn't call her friend."
* Emphasis: "You have to try harder, then you'll succeed."
* In contrast: "He loves pizza, then she prefers pasta."
* With "if": "If you are tired, then you should go to bed."
It's important to look at the context to figure out the exact meaning of "then" in a particular sentence.