Had I known that air conditioners cause so much pollution, I would never have bought one.
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/Had-I-known-that-air-conditioners-cause-so-much-pollution+-I-would-never-have-bought-one.=["Had", "I", "known", "that", "air", "conditioners", "cause", "so", "much", "pollution", ",", "I", "would", "never", "have", "bought", "one", "."][{"i": 0, "s": [0, 11], "r": "固定搭配", "e": [11, 18], "d": {"poses": [0, 1], "piece_poses": [0, 1]}}, {"i": 1, "s": [0, 1, 2, 11], "r": "固定搭配", "e": [1, 2, 11, 18], "d": {"poses": [1, 2, 3], "piece_poses": [0, 1, 2, 3]}}, {"i": 4, "s": [2, 3, 4], "r": "动词固定搭配", "e": [3, 4, 11], "d": {"poses": [2], "piece_poses": [0, 1, 2]}}, {"i": 9, "s": [4], "r": "名词短语", "e": [6], "d": {"piece_poses": [0]}}][{"s": 0, "r": 5, "e": 11, "t": 2}, {"s": 0, "r": 22, "e": 1, "t": 2}, {"s": 1, "r": 3, "e": 2, "t": 2}, {"s": 2, "r": 10, "e": 11, "t": 2}, {"s": 2, "r": 9, "e": 3, "t": 2}, {"s": 3, "r": 20, "e": 11, "t": 2}, {"s": 3, "r": 8, "e": 4, "t": 2}, {"s": 4, "r": 20, "e": 11, "t": 2}, {"s": 4, "r": 3, "e": 6, "t": 2}, {"s": 6, "r": 9, "e": 7, "t": 2}, {"s": 7, "r": 3, "e": 11, "t": 2}, {"s": 7, "r": 6, "e": 8, "t": 2}, {"s": 8, "r": 4, "e": 9, "t": 2}, {"s": 9, "r": 3, "e": 11, "t": 2}, {"s": 11, "r": 3, "e": 12, "t": 2}, {"s": 12, "r": 22, "e": 13, "t": 2}, {"s": 13, "r": 6, "e": 14, "t": 2}, {"s": 14, "r": 10, "e": 18, "t": 2}, {"s": 14, "r": 22, "e": 15, "t": 2}, {"s": 15, "r": 9, "e": 16, "t": 2}, {"s": 16, "r": 3, "e": 18, "t": 2}]{"pred": [12, 16, "谓语动词短语(复合结构)", "would have "], "subj": [11, 12, "主语", "I"], "comps": [[16, 18, "宾语", "one."]]}{"pred": [12, 18, "谓语动词短语(复合结构)", "would have bought •••"], "subj": [11, 12, "主语", "I"], "comps": [[16, 18, "宾语", "one."]]}{"coos": [], "c": null, "e": 18, "subs": [{"coos": [], "c": 2, "e": 11, "subs": [], "s": 4, "r": "宾语从句"}, {"coos": [], "c": 1, "e": 18, "subs": [], "s": 11, "r": "主句"}], "s": 0, "r": "固定搭配"}
sentence Had I known that air conditioners cause so much pollution, I would never have bought one. /Had-I-known-that-air-conditioners-cause-so-much-pollution+-I-would-never-have-bought-one.= 72df1952-5083-45b3-84cc-5e20b4c94d36 1 1
暂无语法

可尝试扩展句子。越复杂的句子，分析结果越丰富。

[[0, 11], [11, 18]]
[]

前置状语 + 主句, 构成状语前置结构

[[0, 1], [1, 2], [2, 11], [11, 18]]
[]

had + sth. + done. + ..., 该以 had 开头的小句, 省略 if 且 had 倒装, 存在虚拟语气

sth.  当前为 I

done.  当前为 known that air conditioners cause so much pollution,

[[2, 3], [3, 4], [4, 11]]
[]

know + (that) 引导的宾语从句

vt. 知道..., 了解..., 对...有了解; 认识...; 熟悉..., 精通..., 对...有研究; 知悉..., 懂得...; 确信...; 确认...; [认识/意识]到...; 记得..., 牢记...; 能[认出/区分]...; [见/听]到过...; 经历..., 经受..., 体验...; 受...[支配/影响]
[[4, 6]]
[]

air + conditioner

n. 空气调节[机/器/设备], 空调[机/器/设备]
[[6, 7], [7, 11]]
[]

cause + sth.

[[7, 8], [8, 9], [9, 11]]
[]

so + much + sth.

[[9, 10]]
[]

pollution

n. 污染; 污染物; 垃圾
[[12, 13], [14, 15], [15, 18]]
[]

mod. + have + done.

[[13, 14], [14, 18]]
[]

never + do.

[[15, 16], [16, 18]]
[]

buy + sth.

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Had I known that air conditioners cause so much pollution, I would never have bought one.

这是一个复杂句。

主句
I would never have bought one.
这是一个陈述句，其时态可以是过去完成时、过去将来完成时、现在完成时、将来完成时。
为什么会有多个时态？情态动词would在不同场景下可以表示不同的时态。
成分划分
I主语 would have bought •••谓语动词短语(复合结构) one.宾语
谓语动词的状语、补语、伴随语:
Had I known ··· pollution,、never
从句
air conditioners cause so much pollution,

这是一个宾语从句，其时态为一般现在时。

成分划分
air conditioners主语 cause •••谓语动词短语 so much pollution,宾语
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