亚洲免费av电影一区二区三区,日韩爱爱视频,51精品视频一区二区三区,91视频爱爱,日韩欧美在线播放视频,中文字幕少妇AV,亚洲电影中文字幕,久久久久亚洲av成人网址,久久综合视频网站,国产在线不卡免费播放

        ?

        情態(tài)動詞must的用法

        2010-05-29 07:17:12吳懷霞
        關(guān)鍵詞:否定句答語時用

        吳懷霞

        must的用法比較多,而且難掌握,現(xiàn)歸納如下;

        1. must的意義

        (1)表示責(zé)任,義務(wù), 意為“必須”。如:

        You must tell me the truth.

        (2)強(qiáng)調(diào)語氣的肯定,意為“一定要”。如:

        I must ask you about your family.

        (3)表示推測,意為“想必”。如:

        He must be at home; the light is on.

        2. must 的時態(tài)

        must只有一種形式, 在將來時里,可用must, 也可用 shall(will) have to。如:

        I must be at home tomorrow.

        I shall have to go there some day.

        must 一般不用于過去時態(tài),它的過去式常用had to代替。如:

        I had to go there yesterday.

        但在下列情況下must也可用過去時:

        (1)在間接引語中。如:

        He said that he must talk with his teacher.

        He decided that he must try to be on the side of the winner.

        I said you mustnt go there.

        (2)作推測解時。如:

        He must have gone to Beijing yesterday.

        (3)作“偏偏”解時。如:

        Just when they were about to go there, they must catch a bad cold.

        3. must的否定式及其答語

        (1)當(dāng)must意為“必須”時否定式是neednt。如:

        You must pay the money, but you neednt do so at once.

        Must I finish my homework now?

        Yes, you must./No, you neednt.

        其否定也可用dont have to。如:

        You must be back by 12 oclock. 變?yōu)榉穸ň鋺?yīng)是:

        You neednt be back by 12 oclock. 或 You dont have to be back by 12 oclock.

        (2)當(dāng)要表達(dá)“絕對不可,不許”時,其否定式是mustnt。如:

        You mustnt do that.

        You mustnt smoke, must you?

        I mustnt let anyone know.

        I must save money, mustnt I?

        (3)表示“推測”時 其否定式為cant。如:

        He must be there.

        He cant be there.

        (4)——May I come in?

        ——No, you mustnt.

        4. must 與 have to

        一般情況下可以通用。如:

        You must(have to) do as you are told.

        但:(1)表示主觀上認(rèn)為的責(zé)任或義務(wù)時用must。如:

        We must try our best to do it.

        (2)表示命令時用must。如:

        You must answer my question in English.

        (3)表示客觀條件不得不如此時,用 have to。如:

        He missed the bus and had to walk home.

        (4)must的否定式表示“絕對不可,不許, 禁止”,have to的否定式表示“不必”。如:

        You mustnt smoke in class.

        You dont have to go there.

        猜你喜歡
        否定句答語時用
        離心機(jī)轉(zhuǎn)速的寫法及相對離心力的正確表示
        離心機(jī)轉(zhuǎn)速的寫法及相對離心力的正確表示
        離心機(jī)轉(zhuǎn)速的寫法及相對離心力的正確表示
        can have done用法小結(jié)
        do和does都是“活雷鋒”
        新目標(biāo)英語七年級(上)Unit8 STEP BY STEP隨堂通
        關(guān)于數(shù)字的俗語連線
        Unit 12 STEP BY STEP 隨堂通
        Unit 7 STEP BY STEP 隨堂通Section A
        學(xué)寫雙重否定句
        亚洲人成在线播放a偷伦| 国产va在线观看免费| 人人狠狠综合久久亚洲婷婷| 大伊香蕉精品视频一区| 亚洲国产一区二区av| 亚洲自偷自拍另类第1页| 伊人久久五月丁香综合中文亚洲 | 亚洲中文字幕国产剧情| 亚洲一区二区三区内裤视| 麻豆成人久久精品一区| 无码日韩精品一区二区免费暖暖| 97在线观看播放| 国产精品毛片无码| 一本一道波多野结衣av中文| 亚洲精品一区二区视频| 久久红精品一区二区三区| 无码任你躁久久久久久久| 欧美日韩国产一区二区三区地区| 中文无码免费在线| 国产内射一级一片高清内射视频| 午夜时刻免费入口| 国产午夜影视大全免费观看| 亚洲视频高清| 在线观看二区视频网站二区| 久久精品国产91精品亚洲| 日韩成人无码| 亚洲精品乱码久久久久久麻豆不卡| 中文字幕日本五十路熟女| 一区二区和激情视频| 欧美黑人xxxx又粗又长| XXXXBBBB欧美| 亚洲av中文字字幕乱码软件| 亚洲av综合一区二区在线观看| 国产成人av 综合 亚洲| 亚洲日本无码一区二区在线观看| 亚洲一区二区三区免费网站 | 国产精品亚韩精品无码a在线| 91精品日本久久久久久牛牛| 日本女优中文字幕在线播放 | 黑人玩弄人妻中文在线| 亚洲AV永久无码精品一区二国|