The pile of paper burned away to nothing.

这堆已化为灰烬。

2 . burn down 烧掉，烧毁。如：

A number of houses were burned down in the fire.

在火灾中烧掉了不少房子。

3 . burn off 烧毁，烧尽。如：

The farmers are burning off the stubble from the fields.

农民正把地里的庄稼茬烧掉。

4 . burn out 烧完，烧掉，烧坏。如：

The building was burned out and only the walls remained.

大楼被烧空了，只剩下墙。

The engine is [has] burned out.

引擎被烧坏了。

5 . burn up

烧完，烧尽。如：

We burned up all the dead leaves in the garden.

我们把花园里所有的枯叶都烧掉了。

烧得很旺。如：

As we gazed, the fire burned up again.

我们正看着时，火又重新燃烧起来。