The use of "so" and "therefore". What's the difference?

[Hoangquanhp]

How to identify them in certain sentences?

[Alan]

Hi,

'So' is very general in suggesting a consequence but 'therefore' provides a direct link.

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Morteza]

Hi Alan,
Could you please give some examples?
I wonder if "therefore" is more formal than "so",specially in writing. :?: :!:
Many thanks,
Morteza