What Is Their Main Difference?
'Then' is an adverb of time that indicates something happened after another one. Look below:
She opened the bathroom door.
'Than' is both a preposition of manner and a subordinating conjunction. We use it for comparison. Look at the examples below:
He is taller
I socialize less
Basically, they have no similarities.
Are They Interchangeable?
Since they have different grammatical functions and meanings, they cannot be used interchangeably. 'Then' refers to the time, while, 'than' is for comparison. Compare:
✓ So, you basically have nothing to talk about other
X So, you basically have nothing to talk about other
As you can see, this one is wrong.
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