关于英语语法,everything is ___ so nice,选择been 还是 being

thanks for being so nice being还是having been? Dear Julie,It is so nice to get your letters.Is everything g 帮忙解释个选择-3___ work is being done, energy is being converted f i am happy that everything is so nice.i love hei. 英语语法 关于being的用法 the pair of shoes ___ nice .用is还是are have been还是have been being? it is not so bad being stupid.being 是伴随状语,还是现在分词做状语? 关于英语语法so far Young Stan ___ like this.A:has always been B:is always being this is the first time I ___ here.A.am being B.have been