引用:
作者: 自由人
天啊，你好像连Google都不会用，只能用那垃圾的百度。 
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http://en.wiktionary.org/wiki/subjunctive_mood
Usage notes
Subjunctive mood is used much more in some other languages, such as Spanish and Latin, than it is in English. Apart from the third-person singular form without the suffix -(e)s (I want that he go), modern English has only one verb that has mutually distinguishable indicative and subjunctive forms — be.
be (subjunctive present, all persons except for archaic second-person singular)
I suggest that that measure be taken.
beest (archaic second-person singular, subjunctive present)
Stephano!—If thou beest Stephano, touch me, and speak to me; for I am Trinculo:—be not afeared—thy good friend Trinculo. -- 1611, William Shakespeare, The Tempest
wert (archaic second-person singular, subjunctive past)
If thou wert pure and upright; surely now he would awake for thee, ... -- 1611, The Bible, Job 8:6 (King James (Authorised) Version)
I know thy works, that thou art neither cold nor hot: I would thou wert cold or hot. -- 1611, The Bible, Revelation 3:15 (King James (Authorised) Version)
were (first- and third-person singular, subjunctive past)
If John were here, he would know what to do.