this/that as adverbs

[Little man]

Hello.
I have a question about "that" and This".
If we use them as adverbs their meaning is pretty much equal to "so", for me at least.
For example lets examine these sentences:


I hadn’t realised that things had got this/that/so bad.
No one expected it to cost that/this/so much.
I was that/this/so embarrassed I didn’t know what to say.


For me, they all are used as emphatic words. Then, what is the difference, and where can I read about usage this/that in that manner?
Thank you in advance.

 

[andrewg927]

No difference between them in the first two of your examples. The last one only "so" works. You can look them up in a dictionary for more information.