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burn down, burn up, burn out
bum down 指烧为平地，烧毁也指火力减弱。
The house was burnt down in an hour.
房子一小时被烧为平地。
bum up 有烧旺之意，也可指消耗掉。
Youd better put more wood on the fire to make it burn up.
你最好往火上添着柴，让它烧旺。
bum out 指火熄灭。
The fire had burnt out before I returned.
在我回来前，火已经熄灭了。