the difficulty of forging personal connections between teach

the difficulty of forging personal connections between teachers and students.这句话的语法,我英语特别不好,正在做练习题,碰到了很基础的一个问题搞不懂,希望大人指教我以下三个问题.the difficulty of forging personal connections between teachers and students1.这句话怎么找不到主谓宾成分呀?主谓宾在哪?没有主谓宾也能成句子?2.forging与connection是名词修饰名词吗?3 .短语能充当什么成分,如何组成短语?这是出处 Only years later did we understand the trade-offs this involved:the creation of excessive bureaucracies(官僚机构),the difficulty of forging personal connections between teachers and students.