It was unusual for there to be so few flowers in the park.帮我

there to be so few flowers in the park, 不定时 做 正式主语, it 是形式主语它可代表着整个there to be .呀,
句子可以这样来说：
There to be so few flowers in the park was unusual .
be unusual for 固定搭配.
Dear: 懂了吗, 自己能瓣过来了吗.
再问： 恩，一开始就是不懂for there to be，现在知道了there to be是there be 的不定式结构，但还是不懂for后面怎么直接跟不定式，for后面不是应该跟名词，再跟不定式吗？ 但是我又觉得这里的there to be 不是不定式，是不是应该for there跟to be 分开来看？ 是不是这样理To be so few flowers in the park was unusual for there？
再答： For ther to be ....... For 后面常用动词不定式 【there to be..............】 还有句子： It is important 【for there to be a fire escape at the back of the building.】 【for there to be a fire escape at the back of the building.】是真正的主语 is 是和important作表语。 那你就可以分析 It was unusual 【 for there to be few flowers in the park.l】 我从语法书上翻来的，你搞得我寝食不安哦。