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可尝试扩展句子。越复杂的句子,分析结果越丰富。
In such dry weather, the flowers will have to be watered if they are to survive.
这是一个复杂句。
the flowers will have to be watered if they are to survive.
the flowers主语
will have {to do.}谓语动词短语(复合结构)
to be watered ··· survive.to do.
In such dry weather,they are to survive.
这是一个状语从句,其时态为一般现在时。
they主语
arebe 动词
to survive.表语(不定式)