TheotherdayIwasshowingtheboystheweeklychemistryexperimentwhen,beforeIknewit,themixturewasbubblingovereverywhere.中when的作用

Question

The other day I was showing the boys the weekly chemistry experiment when,before I knew it ,the mixture was bubbling over everywhere.中when的作用

Answer 1

因为这个when是连接后面的句子the mixture was bubbling over everywhere!的.
The other day 是i was.这个句子的时间状语,只是提前了而已.befoer i knew it是个插入语,可以不管它.