The execution of the arrangement so thrilled him that he felt as though he were walking on air.

请问:

1.execution of the arrangement 是安排的执行的意思吗？

2.so thrilled him 怎么理解这个写法?

3.as though he were walking on air 是什么从句, air为什么不需要the呢？

1. The execution of the arrangement： “执行这个约定/协议”。

2. so thrilled him：so 是“程度副词”，修饰动词 thrilled。意思“如此使他激动”。

3. as though he were walking on air 是“表语从句”，felt 是系动词。walk on air 习语，不可更改。意为“洋洋得意；飘飘然”。