had started是什么时态

A small fire had started in the kitchen.

厨房失火了，燃起了一股小的`火苗。

Water had started to leak into the cellar.

水已开始渗入地下室。

She had started to delve into her father's distant past.

她开始探究她父亲久已逝去的岁月。

He was afraid the revolution they had started would fail

他担心他们发起的大变革会遭遇失败。

She had started to devote her energies to teaching rather than performing

她已经开始将精力从表演转移到教学中。