It rained too heavily for the children to go to school表达正确吗？

应该用It is raining too heavily(or hard) for the children to go to school.
对孩子们来说雨下得太大不能去上学.
too... to... 太...而不能

It rained too heavily for the children to go to school.
正确，但是我感觉,It rained too heavily to go to school for the children .更好点吧,把too....to...放在一起,在怎么..而不能做...

语法正确，没什么语病，就这样可以！看你表达的是什么意思，如果是因为雨太大而孩子不能去上学的话，最好用too...to...The rain was too heavy for the children to go to school.
你那段话的意思是雨太大了对于孩子去上学来说。

不好吧?
too..to的格式用于系动词be，而且too之后加形容词。即：be too+ adj. + to do sth.
可以改为：The rain was too heavy for the children to go to school.

不对

正确