They're never at home because they're so / such busy people.
such
It's so / such a lovely day today - let's go to the park.
such
Becky made so / such a good impression when she met my parents.
such
There were so / such many people at the restaurant we couldn't get a table.
so
He's so/such adventurous and loves extreme sports.
so
That was so / such an irresponsible thing to do!
such
The book was so / such an interesting - I read it in one day.
so
I had so / such much work to do yesterday.
so