I came across this sentence in A Thousand Splendid Suns by Khaled Hosseini:
As happy as she was about this pregnancy, his expectation weighed on her.
I was trying to parse this sentence and was trying to understand the meaning. I checked The Cambridge Grammar of The English Language (CaGEL) for any possible explanation, but of no help. I didn't find anything similar there. The possible meaning I derived from it is: She was happy about this pregnancy by X amount, his expectation weighted on her by X amount.
Question 1: Is my understanding about the meaning correct? And what is the possible explanation about the sentence structure? Any reference to CaGEL?
I then turned to COCA for similar sentences. But I got more confused. The sentences that made me confused are:
As good as this burger tasted, he should have ordered two. [I think this sentence is semantically different to the sentence I found in the book. I think this sentence means Because this burger tasted so goof, he should have ordered two.]
As good as the food is, it would be even better if the menu were scaled back so Silargorn could concentrate on the dishes that set him apart. [And I think this is semantically different to the other two. I think it means Because the food is very good, it would be even better if ...]
Question 2: What is meaning of the two sentences from COCA? And can you please parse these sentences? And reference from CaGEL?