“Than” is used in comparisons (比較) “Then” is used to indicate something following something else in time, as in step-by-step instructions, or planning a schedule (“we’ll go to Umeda then eat lunch”).
How not to do it:
- You are better at speaking Japanese then me.
- I have more then enough plastic bags at home.
- We'll go to dinner first, than go drinking!
How to do it properly:
- You are better at speaking Japanese than me.
- I have more than enough plastic bags at home.
- We’ll go to dinner first, then go drinking!