Question

请帮忙讲解一下以下这句话： He discovered that a lot of the patients were happier and caused less

troubleif pleasant music was played to them.要语法啊

Answer 1

这个句子是从句中套有一个从句。
He discovered 是主句，that引导一个宾语从句a lot of the patients were happier and caused less
troubleif pleasant music was played to them。

而在这个从句中有一个if引导的条件壮语从句 if pleasant music was played to them
a lot of the patients were happier and caused less trouble 这个是这个从句中的主句，由and连接，
a lot of the patients were happier 和 a lot of the patients caused less trouble。

意思：他发现如果给病人播放欢快的音乐，他们会更加开心并制造更少的麻烦。