Then (adverb): Refers to time. It indicates something happened after another event.
Than (conjunction): Used for comparisons. It connects two things or ideas to show a difference.
Here are some examples:
Then:
* I ate dinner, then I watched TV. (Indicates the order of events)
* She was sad, but then she received good news. (Shows a change in emotion over time)
Than:
* My dog is bigger than yours. (Compares size)
* I like apples more than oranges. (Compares preference)
* He is older than she is. (Compares age)
Putting it together:
* I went to the store, and then I came home. My groceries were heavier than I expected. (Uses both correctly)
Remember: If you're unsure whether to use "then" or "than," consider whether you're talking about time or comparing something.