He finds it hard to keep pace with the development in physics.He finds that it is hard to keep pace with the development in physics.这两句有什么区别,有没语法错误?

He finds it hard to keep pace with the development in physics.
He finds that it is hard to keep pace with the development in physics.
这两句有什么区别,有没语法错误?

语法没有错,第一句更简练,常用.
第二句是find的从句,也对.
它们表达的意思一样.

两句都正确，第一句是find的宾补更简洁，第二句是find的宾语从句是个小句子