when引导的是什么从句，分析一下从句成分，

Question

when引导的是什么从句，分析一下从句成分，Firefighters were called when a gas-tank exploded in a backyard of a home on Baihai Road.

Answer 1

when 可以引导很多从句：
1.宾语从句：例如 I don`t know when he left here.我不知道他上面时候离开的.此时when作连接词引导宾语从句.
2.定语从句：例如 He left his hometown in that year when his father died.他在他父亲死的那一年离开了他的家乡.此时when作连词修饰that year,引导定语从句.
3.状语从句：例如 He will go to the doctor`s when it is sunny.当天晴时,他就会去看医生.此时when引导状语,意思是“当...时候”.
4.主语从句：例如When he left here is a question.他上面时候离开这儿的还没有人知道.此时when引导主语从句,意思是“什么时候”

Answer 2

Firefighters were called when a gas-tank exploded in a backyard of a home on Baihai Road.
when引导时间状语从句，是个连词。
when从句结构：a gas-tank主语 exploded谓 in a backyard of a home on Baihai Road地点状语.追问

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Answer 3

时间状语从句追答

前面主句后面从句

追问

那从句应该没有宾语吧，只有主语，谓语，地点状语，对吗

追答

对 主谓结构也是完整的句子