Then has various different uses. Look at the following examples:
AT A TIME IN THE PAST
- I used to live here in the 90s and I haven’t been back since then.
- Do you remember how much we used to play in this garden?
- Yes. We were so carefree then.
NEXT (after something)
- First, beat the eggs then add the milk.
- Sharon spent a few minutes reading, and then went to sleep.
IF SOMETHING IS TRUE
- I can’t stand my new boss.
- Then you’ll need to look for a new job.
- But I love my job.
- Try to talk to him then.
On the other hand, than is mainly used in comparative sentences:
- MyEnglishTeacher.eu is more fun than most other online schools.
- My English is much better than my sister’s.
- She’s younger than me.
- I’ve got more books than her.
- Our dog is more intelligent than yours.
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