帮忙分析一下这句英语No sooner had the bell rung than the gate opened and out went groups of studen

Question

No sooner had the bell rung than the gate opened and out went groups of students.

疑问: 这个句子怎么断句?另外out went是怎么回事,为什么这样写?

Answer 1

这应该是并列复合句，其语法结构如下：

第一分句 No sooner had the bell rung than the gate opened
〔主语〕the bell
〔谓语动词〕had … run
〔时间状语〕no sooner
〔比较状语从句〕than the gate opened

第二分句 and out went groups of students (=groups of students went out 的倒装，目的是强调一群学生走出来的突然性)
〔主语〕groups of students
〔谓语〕went out