1
He is so nice person!
He is such a nice person!
He is so nice!
Use so and such to make a description stronger.
Use so before an adjective or adverb: ‘so nice’, ‘so quickly’.
Use such a/an before an adjective and a singular countable noun: ‘such a nice person’, ‘such an interesting book’.
Use such before a plural or uncountable noun: ‘such nice people’, ‘such bad weather’.
See SUCH A
2
I’m so tired to go out tonight.
I’m too tired to go out tonight.
I’m so tired that I can’t go out tonight.
Use too before an adjective followed by to + infinitive: ‘I’m too tired to go out.’
Use so before an adjective followed by that + clause: ‘I’m so tired that I can’t go out.’