it's impossible to know which of the winners would have quit had they found themselves on the losing side
主句,陈述核心结论:不可能知道某件事
成分推断 · 3 项
谓语 is
- 先在主句中寻找动词。观察到缩写形式"it's",展开为"it is",其中"is"是系动词,在本句中连接主语"it"和表语"impossible to know..."。
- 确认"is"是本分句唯一的谓语动词:句中虽有"to know"和"would have quit"等动词形式,但"to know"是不定式短语作真正主语,"would have quit"位于宾语从句内,都不是主句的谓语。因此"is"是主句的谓语。
主语 it
- 系动词"is"前面是"it",位于句首主语位置。但观察到"is"后面跟着形容词"impossible",再后面是不定式短语"to know which of the winners would have quit had they found themselves on the losing side"。
- 这是典型的"it + be + 形容词 + to do"结构,其中"it"是形式主语,真正的主语是后面的不定式短语"to know which of the winners would have quit had they found themselves on the losing side"。形式主语"it"本身不表达实际意义,只是占据主语位置,使句子结构平衡。
表语 impossible to know which of the winners would have quit had they found themselves on the losing side
- 系动词"is"后面直接跟着的是形容词"impossible",系动词后接形容词或名词作表语,说明主语的性质或状态。
- 但表语不止"impossible"一个词。"impossible"后紧跟不定式短语"to know which of the winners would have quit had they found themselves on the losing side",这个不定式短语与"impossible"构成紧密的逻辑搭配,说明"不可能"的具体内容是什么,因此整个"impossible to know which of the winners would have quit had they found themselves on the losing side"共同构成表语部分。
时态 · 语态 · 语气
时态 一般现在时
语态 主系表(不适用)
语气 陈述语气
判定依据
- 时态判定:谓语是"is",这是be动词的现在时第三人称单数形式,没有完成体标志(have/has + 过去分词),没有进行体标志(be + 现在分词),没有情态动词,因此是一般现在时。
- 语态判定:本句谓语为系动词"is"加表语"impossible to...",构成主系表结构。系表结构本身不涉及动作的施受关系,因此语态不适用。
- 语气判定:句子为陈述句,陈述一个客观判断"不可能知道",没有虚拟语气标志(如与事实相反的假设、特殊的动词形式),也不是祈使句,因此是陈述语气。
语义说明 一般现在时表达的是一个普遍成立的判断或客观事实,说明"不可能知道"这一结论是当前的、普遍的认知状态,而非仅限于过去或未来某个时间点。系表结构通过"impossible"直接描述"to know..."这件事的性质特征。