it must be terrible tobe grown up请帮我分析一下这句的语法结构

it must be terrible tobe grown up请帮我分析一下这句的语法结构 it must be terrible to be grown up.这句,是一句话还是两句.这句的语法我不太懂,尤其是 It must be terrible to be grown up!这是形式主语,真正的主语to be grown u Darling ,it must be terrible to be grown up . It must be terrible to be grown up. ‘Darling,it must be terrible to be grown up ' It must be terrible to be grown up!grown up与grow up有什么区别 it must be terrible to be grown up!be的作用 It must be terrible to be grown up!这句话里为什么要加be呢? it must be terrible to be grown up句中to可以不要吗 it must be terri it must be terrible to be grown up 中的grown up 什么词性 关于英语的一个小问题It is a pity to be grown up.(it做形式主语)请帮我分析下这句话的句子成