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有一种"含蓄虚拟条件句"是指没有出现用if引导的条件句，而条件句的意思是用其他方式表达的。如：without, but for, otherwise, or, but that, given, provided, supposing, were it not for等等。例如：Given me more time, I would have worked out a more perfect scheme.

标签：虚拟、句型　　难度（6）｜用途（4）｜标记（ ）

在含蓄条件句中，有些条件从句不表达出来，只暗含在副词、介词短语、上下文或其他方式中。比如，条件可以暗含在短语中，如without...，but for...等。比如：But for his help, we would be working now./Without your instruction, I would not have made such great progress.

标签：条件句、意义　　难度（6）｜用途（5）｜标记（ ）

把条件暗含在短语中的含蓄条件句是很常见的。如：We didn't know his telephone number；otherwise we would have telephoned him.暗含条件是otherwise；Without your help, we wouldn't have achieved so much.暗含条件是介词短语without your help。

标签：条件、短语　　难度（5）｜用途（4）｜标记（ ）

在whatever, whichever, whenever, whoever, wherever, however, no matter wh-等引导的让步状语从句中，如果指现在或将来，从句虚拟语气结构为may＋do。比如：We will finish it on time no matter what may happen.如果指过去，从句要用may＋have done。比如：You mustn't be proud whatever great progress you may have made.

标签：虚拟、引导词　　难度（4）｜用途（6）｜标记（ ）

热门词汇

otherwise adv. 否则；另外

provided conj. 假如；倘若

perfect adj. 完美的；最好的

scheme n. 计划

instruction n. 指令；指示

achieve vt. 达到；完成

whatever conj. 无论什么

progress n. 进步，发展

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常用词组--could have done

　　与"can have done"的意思差别很大，"could have done"是虚拟语气，表示对过去事情的假设，意思是本来能够做某事而没有做。比如：He could have passed the exam, but he was too careless.（本来他能够通过考试，但是他太粗心。）