Examples:
1. That's so big building.
2. So big flavor.
3. So relax! So enjoy!
First, here are the correct ways to say those examples:
1. That's such a big building.
2. "Such big flavor" or "So much flavor"
3. So relaxing! So enjoyable!
You'll notice that the above uses the words "so" and "such" a lot. Generally speaking, 'such' takes a noun phrase, whereas 'so' takes an adjective.
Other uses of the word "so":
'So … that'
'So … that' takes an adjective. 'That' can be used following the noun phrase but is not required.
So + adjective + that/this
Example:
The game was so fascinating that he played for hours.
'So' for Results
'So' can also be used to express a result. In this case 'so' is followed by a full clause:
Examples:
I had a lot of time so I visited the museum.
She wasn't happy in her current position so she looked for a new job.
Here's a link to a quiz to help you test your new words: