条件句是拉丁语语法专名，英文称作the conditional sentence，是指一种表示假设的主从复合句，一般由连词 if 引导的条件从句引出某种假设，再由主句表示基于这种假设下的反馈。中文翻译为 “如果或假如……那么……”。
三种基本形态 英语中的条件句(conditional clause)可分为真实条件句（conditional real clause）和非真实条件句（conditional unreal clause）,他们主要if来引导。
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反事实条件句 counterfactual conditional ; counterfactual conditionals
含蓄条件句 adverbial clause of implied condition ; Sentences of Implied Condition ; implied conditional ; sentence of implied condition
错综条件句 adverbial clause of mixed condition
真实条件句 Sentences of Real Condition ; real conditional ; First Conditional
虚拟条件句 Sentences of Unreal Condition ; Unreal conditionals
非真实条件句 Unreal conditional ; Second conditional ; Unreal Conditional Clause
用于条件句中 in conditional sentences
错综时间条件句 Conditional Sentences of Mixed Time
条件句型 Patterns of Condition
The present study aims to investigate the acquisition of English counterfactual conditionals by Chinese learners.
本研究旨在调查中国大学生对英语非真实条件句的习得情况。
参考来源 - 中国学习者对英语非真实条件句的习得研究The probability approach of conditionals is a hypothesis that conditional probability is the probability of a conditional,some scholars usually called it as Adams’ Thesis.
条件句的概率进路是指人们把条件句的概率看作相应的条件概率,学界通常把这种思想称为"亚当斯论题"。
参考来源 - 直陈条件句与“亚当斯论题”·2,447,543篇论文数据，部分数据来源于NoteExpress
你们明白实际上这是个条件句，一个复杂句也可以是结论。
Can you see that the fact that it's a conditional sentence a complex sentence doesn't stop it from being a conclusion.
我认为使用unless加else条件句就好像在讲双重否定。
I think using unless with else is like speaking with double negatives.
要不是的帮助，我就不能提前完成这项任务。(与过去事实相反的虚拟条件句)。
If it hadn't been for your help, I couldn't have finished it ahead of time.
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