MOOD英语的语气
在英语中，有三种“语气”。语气是一种用动词来表示说话人对他所说的话的态度的方式。最常用的是陈述语气表达事实。所有时态中所列出的例句都是陈述句。
另外两种语气是祈使语气和虚拟语气。（也有把感叹句看成是一种语气。）
这里重点讨论祈使语气和虚拟语气。
祈使语气
祈使句是用来表达命令的。英语中的肯定的祈使句采用动词的基本形式:
“Give me a wrench.”“Clean your room.”“Read this report, then give it to the supervisor.”“Send us your address.”
否定形式的祈使句为“Don't” 动词原形.
“Don't call me at work.”“Don't be late.”“Don't forget your lunch.”
重要的是要记住，只有少数几种情况下才可以使用命令形式，比如对孩子说话，对你的学生说话，给予指示等等。否则，用情态动词“would”、“could”、“will”和“can”来请求别人做事会更礼貌:
“Could you give me a wrench, please?”“Will you please clean your room?”“Would you read this report, then give it to your supervisor?”“Can you send us your e-mail address?”
虚拟语气
虚拟语气是用来表达情绪、怀疑、欲望和可能性的。
“If I were (not “was”) a rich man, I'd travel all over the world.”“If she were (not “was”) any taller, she'd be taller than her husband.”
虚拟语气也与动词wish一起出现在从句中:
“I wish I were (not “was”) in California.”
虚拟语气用于宾语补语，而主句中的动词是“suggest”、“recommend”、“demand”、“ask”等动词。
“I suggest that he take (not “takes”) the day off.”“I demand that all employees be (not “are”) here on time.”“They asked that we sing in the choir.”
虚拟语气也可以在以“It is important that…”开头的句子中表达:
“It is important that you be (not “are”) ready for an emergency.”“It is very important that I be (not “am”) prepared for the presentation.”
最后，虚拟语气仍然在既定的或习惯表达中使用，如“(May) God bless you”，“So be it”，“(May) God be with you”等。详细的请参考英语的虚拟语气。
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