1. 祈使句的特征:
    ①祈使句用來表示請求、命令、建議、勸告、警告等。如:
    Go and open the door.
    ②其主語一般是第二人稱,但往往被省去。
    ③其謂語須用動詞原形,否定結構是在動詞原形前加don’t。如:
    Don’t be late.
    ④句子末尾用句號或感嘆號,通常用降調。為表示禮貌,句前或句末可加上please。如:
    Be quiet, please. = Please be quiet.
    ⑤祈使句一般沒有時態(tài)的變化,也不與情態(tài)動詞連用。
    2. 祈使句的幾個注意問題:
    ①肯定的祈使句前可用助動詞do來加強語氣,多譯為“一定……”。如:
    Do have some more tea.
    ②祈使句除用動詞開頭外,還可用名詞、形容詞、副詞等開頭。如:
    Hands up! / No parking! / No fishing! / Careful! / Quickly! / Help! / Another cup of tea, please. / Just a minute, please! / This way, please!
    ③祈使句的主語在需要強調時可以出現(xiàn)。如:
    Nobody move. / Don’t you forget. / Stand up, everybody. / You go away.
    ④祈使句之后的附加疑問句:
    ●在肯定的祈使句之后,附加疑問句常用will you? / won’t you? / would you? / could you? / can you? / can’t you? 如:
    Have dinner with us, will you? / won’t you? / would you?
    ●在否定的祈使句之后,附加疑問句常用will you? / can you? 如:
    Don’t make a noise, will you? / can you?
    ●以let’s 開頭的祈使句之后,附加疑問句常用shall we? 如:
    Let’s go out at about six o’clock, shall we?
    ⑤當祈使句之后用and / or連接另一個分句時,該祈使句相當于一個條件句。如:
    Try again and you will succeed. (=If you try again, you will succeed.)
    Write it down, or you will forget it. (=If you don’t write it down, you will forget it.)
    ?
    

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