I am sad to be here watching you all heading back home 句中watching用法

I am sad to be here watching you all heading back home 句中watching用法 I Am Trying Very Hard To Be Here 歌词 I am lucky to be here中to be here是什么成分 I'm sad to be here watching you all hearing back home这句话是什么意思? Used to be used toI used to be living here .I am used to living here.为什么第一句不对? i am very happy to be here with you this evening为什么用to be I was here,I am here,I will be i am very sad I am so sad Don't be sad,and so am I. when I am sad,I stop being sad and be awesome instead是什么意思中文, i am very glad（ ）here A to be B be C come I am so sad that i prefer to go alone. I am very glad to be here.here前为什么加be,而I have many friends here.却没有加'be'. be动词后面能用feel吗 比如I am feeling sadI feel sad 和I am feeling sad哪个正确 i am glad to be here for this interview什么意思? here i am to be togehter 出自哪一首歌这是一首国语歌里的一句歌词. here i am to be togetther是什么歌是广东卫视《台北故宫》节目的片尾曲