burn是延续性动词还是非延续性动词

不是，应该是终止性的。

burn down烧毁

They threatened to burn down our house.

他们威胁要烧毁我们的房子。

Two children were rescued from the burning car.

两名儿童从燃烧着的车中被救了出来。

牛津高阶英汉双解词典

The smell of burning rubber filled the air.

空气中弥漫着橡胶燃烧的气味。