His speech led me to the understanding that it is of importance to learn English.

that从句能做动名词的宾语构词动名词短语吗？

【答】lead sb. to 导致某人倾向某事

动名词由动词变来，可以有自己的宾语，宾语可以是一个词，也可以是名词性从句（包括that引导的从句）；也可以有自己的状语修饰它。例如：

She persuaded him into believing firmly that she was unmarried. 她说服他相信她是未婚的。

believing是动名词，that she was unmarried是宾语从句，firmly是状语。

We were deceived into believing that he could help us.我们受骗了，还以为他能帮助我们。

但是，你这个句子中的understanding是名词，因为前面有the，那么，that it is of importance to learn English 不是宾语从句，而是同位语从句，说明understanding的内容。