i am glad to be at your service.句型上（主谓宾）怎么分析?还有为什么是用to be at

i am glad to be at your service.句型上（主谓宾）怎么分析?还有为什么是用to be at I'am pleased to be at your service.意思? I am glad to be your penfriend I am glad to be I am really glad to be dead. I'd be glad to.but I am not very good at it.would you mind t 帮帮忙单词连句 1、to am i very glad be here 2、at my are parents ,hom I am honored to be with you today at your commencement from I am looking forward to be with you and look at your eyes hello,everyone i am linda.l am glad to be I am glad to your 英语翻译Dear Mike,I am very glad to be your pen friend .Do you w