这种祈使句里的宾语也是第三人称为主。除了口气凶悍之外，有时还语带讽刺，如：
(7) Let him try and he will expose his inability to work on his own.
(8) Let the invaders come and our armed forces will wipe them out in no time.
用"let"的祈使句时，必须注意下列几点：
一、"let" 的否定句有二。如果宾语是第三人称用"Don't let……"(见例(9));如果宾语是第一人称，则用"Let……not" (见例(10))：
(9) Don't let this type of things happen again.
(10) It's raining now. Let's not go out until after the rain.
二、"Let"只适用于现在时态，可以有被动语态 (the passive voice),如：
(11) Let the recalcitrant criminals be sent to prison.
(12) Let all the dedicated capable staff be promoted.
三、"Let"后头除了是不带"to"的不定式动词 (The infinitive without"to")之外，还可以是某些适当的副词，如out, in, down, alone等：
(13) Let the puppy out.
(14) Open the windows and let the fresh air in.
(15) The room is too sunny. Let the blinds down.
(16) Let me alone, please.
四、用"Let's"时，把谈话者的对象包括在内;用"Let us"时，并不包括对方，如：
(17) Let's try it, shall we?
(18) Let us do it by ourselves, will you?
从(17)里的"shall we"和(18)里的"will you"，不难知道前者包括听话人，后者并没有。
与初高中英语教材同步的新品语法图书
全国新华书店已经上市，欢迎向山西教育出版社0351-4729742垂询，欢迎一线英语教研员，老师推荐学生使用
返回搜狐，查看更多