题目内容：

We found it was very useful to learn English well
同义句替换We found ______ ______ ______ ______ ______English well

优质解答

同义句为 We found it very useful to learn English well.
原句it was very useful to learn English well是it做形式主语不定式做真正主语的宾语从句.改为it做形式宾语不定式做真正宾语就可以了.