Hot air balloons have burners to keep the air hot.动词不定式做定语还是做目的、结果状语?

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Hot air balloons have burners to keep the air hot.动词不定式做定语还是做目的、结果状语?

其实to keep the air hot既是定语,也是目的状语,也是结果状语.
是burners的定语,也可作have burners的目的状语或结果状语.
这三种语态是有重叠区的,区分时首先从结构考虑,另外还要考虑上下文意思.
He bought a gun to kill the president.But he gave up later.这里不定式就是目的状语了,而其他两个语态都不适用.

Hot air balloons have burners to keep the air hot
to keep the air hot动词不定式做定语