I didn’t know what to do when the accident happened解释句子是同义句转换！

I didn’t know what to do when the accident happened解释句子是同义句转换！
I didn’t know what to do when the accident happened
解释句子
是同义句转换！

I didn’t know what to do when the accident happened解释句子是同义句转换！
在事故发生的时候我不知道做什么