with的复合结构可用to be done
例句：With many trees and flowers to be planted， the school will be more beautiful.
这个句子中，plant的施事者并没有在句中出现，所以不定式不能用主动形式，只能用被动语态。此时with后接复合宾语，即构成with复合结构。
with的复合结构既可以用to be done，也可用不定式
例句：With a lot of work to do， Allen has to give up his part time job
With many trees and flowers to be planted， the school will be more beautiful.
形式结构上来讲，这个是比较典型的with+宾语+介词短语的with复合结构。with sth to be done是从with sth to do演变过来的，结构没有毛病，实际应用时参考语境就可以了。
