虚拟语气是英语语法中的一个重要部分，主要用于表达与事实相反的假设。以下是虚拟语气的10大必背句型：

与现在事实相反

句型结构：If + 主语 + 动词的过去式（be动词常用were），主语 + should/would/could/might + 动词原形

例句：If I had enough money, I would run a company of my own.

与过去事实相反

句型结构：If + 主语 + had + 过去分词，主语 + should/would/could/might have + 动词过去分词

例句：If you had come earlier, you could have seen the teacher.

与将来事实相反

句型结构：If + 主语 + 动词过去式/were to + 动词原形/should + 动词原形，主语 + should/would/could/might + 动词原形

例句：If it should rain tomorrow, we would stay at home.

wish后接宾语从句

现在：Wish + （that） + 过去分词

过去：Wish + （that） + had + 过去分词

将来：Wish + （that） + would/could/might + 动词原形

例句：I wish I had studied harder.

as if/as though

例句：He acts as if he were the boss.

It’s high time that

例句：It’s high time that you should stop smoking.

If only

例句：If only I had more time.

条件句中的虚拟语气

例句：If I were you, I would take the job.

名词性从句中的虚拟语气

例句：They suggested that we should stay at home.

命令、要求和建议的虚拟语气

例句：He ordered that the work should be finished by noon.

这些句型涵盖了虚拟语气在英语中的主要应用，掌握这些句型有助于提高英语写作和口语表达的准确性和生动性。