表示命令、請求、勸告、禁止、請願時，所用的句子叫做『祈使句(祈使語氣)』。




A. 主詞(you)省略；除非為了要__________________，才出現。
Stop!
Come in.
Walk two blocks down the street. Turn left and walk three more blocks.




B. 動詞原形開始；所以中文句子中找不到動詞時，以________開始。
Open the door.
Be my guest.
Be careful.




C. 表示『 』時，用Don't＋動詞原形。Never(永遠不要；千萬不要；絕對不可以)＋動詞原形語氣比Don't強。也可以使用__________＋名詞。
Don’t be fussy.
Don’t stand near the door!
Never tell a black lie.
Never fear!
No smoking.
No exit.




D. 肯定句可加上『 』(務必)以加強語氣。
Do remember me!
Do be diligent!




E. 表示禮貌，可以加上『 』。please＋動詞原形。please如放句尾，前面需加『 』。
Annie, help me, please. = Please help me, Annie. = Annie, please help me.
Please do come tonight.
Please bring me a cup of coffee.




F. 可加上『稱呼語、人名』於句首或句尾，但均須加『 』。
Eat your dinner, Tony.
Run, John!
Be good, Mary. = Mary, be good.




G. 如果祈使的對象是第三者或包括自己在內，則用”_________”。
Let us go!
Let him do that!
Live and let live! (和平共處！)
Don't let us do that!