分析一下这个英文句子的语法结构？

Question

i am extending to you our formal invitation to visit our corporation on its tenth anniversary to be calebrated from August 1 to 3.

Answer 1

i （主语）am extending（正在进行时，谓语部分） to you（间接宾语） our formal invitation （直接宾语）to visit our corporation （不定式作后置定语，修饰invitation）on its tenth anniversary(介词短语，作状语) to be calebrated from August 1 to 3（不定式短语作后置定语，修饰anniversary）追问

i am extending our formal invitation什么意思？

追答

我发出正式邀请。。

追问

be extending什么意思？

追答

动词extend的现在进行时，vt. 发出（邀请、欢迎等）；例如 It was kind of you to extend an invitation to us感谢你对我们的邀请.

Answer 2

i 是主语am extending to 是谓语you是间接宾语 our formal invitation是直接宾语 to visit our corporation on its tenth anniversary to be calebrated from August 1 to 3是不定式短语作定语修饰our formal invitation.

其中 to visit是不定式 our corporation是不定式的宾语 on its tenth anniversary是不定式的状语
to be calebrated from August 1 to 3是定语修饰its tenth anniversary