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上几期介绍了祈使这一语法现象，英语语法：动词开头的祈使句、系表型祈使句、包含说话人的祈使句与非动词型祈使句。接下来几期，我们将重点介绍虚拟语气这一语法现象，这一期学习英语语法：三种时间的纯假设基本句型。 英语中用得最多的是陈述语气，其次是疑问、祈使语气，只有很少一些场合用虚拟语气。 虚拟语气，主要有4种类型： 1.表示纯假设（非真实条件） 2.表示请求 3.表示命令、要求、建议 4.表示愿望 三种时间的纯假设基本句（以be, do, work为例）： | 从句 | 主句 | 与现在事实相反 | 过去时 | 过去将来时 | +were/was…, If+主语+worked +were wroking If she were a bird, 如果她是一只鸟， If you worked here, 如果你在这工作， | +would/should be… 主语+would/should do +might/could work She would fly in the air. 她就会在空中飞翔。 We would discuss together every day. 我们就会天天一起讨论。 | 与过去事实相反 | 过去完成时 | 过去将来完成时 | +had been…, If+主语 +had worked If we had been careless, 要是我当是时很粗心， If they had failed last time, 如果他们上一次失败了， | +would/should have been… 主语 +might/could have worked we would have made a serious mistake, 我们就已犯了严重错误了。 they would have given it up. 他们就会已经放弃了。 | 与将来事实相反 | 过去一般时/过去将来时 | 过去将来时 | +were…, If+主语+worked +should work If he were to come back, 如果他以后回来， If she should fail again, 如果她将再一次失败， | +would/should be… 主语 +might/could work I would be the first to meet him. 我会是第一个迎接他的。 she might not give up. 她也许不会放弃。 |
注意：在If I were you中I只能接were,不能接was。但其他人称的代记后不管单复数都接were，单数也可接was. 感谢阅读！
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