虚拟语气用在It is +形容词+that的主语从句中 在某些表示愿望.建议.请求.命令等形容词后的主语从句中.需用虚拟语气.其表达形式为should +动词原形或省略should直接用动词原形.这类形容词有 advisable.appropriate.compulsory.crucial.desirable.essential.imperative.important.incredible.natural.necessary.possible.preferable. probable.strange.urgent. vital. It is essential that these application forms be sent back as early as possible．这些申请表应尽早地寄回.这是很重要的. It is vital that enough money be collected to fund the project．重要的是募集足够的钱.为这个项目提供资金. 【查看更多】
