文档介绍：肯定句变否定句肯定句变否定句九则
一、句中有be动词指is , am , are , was , were、情态动词指can , may , must…、助动词指will , shall , have , has , had的，在其后面直接加not。如：
　　is a student.
　　He is not a student
　　mother can speak Japanese.
　　Her mother can not speak Japanese
　　will go to Beijing next Sunday.
　　They will not go to Beijing next Sunday
　　have already watched this TV play.
　　You have not watch this TV play yet.
　　二、句中的谓语动词是原形、第三人称单数、过去式的，则应在谓语动词的前面分别加上do not(don"t) , does not(doesn"t) , did not(didn"t)，切记：把谓语动词变为原形。如：
　　get up at 6:00 in the morning every day.
　　I don"t get up at 6:00 in the morning every day.
　　likes swimming.
　　She doesn"t like swimming.
　　asked me a question yesterday.
　　He didn"t ask me a question yesterday.
　　三、句子为祈使句的，在句首直接加Don"t。如；
　　at the blackboard.
　　Don"t look at the blackboard.
　　四、句中有had better的，在其后面直接加not，如：
　　had better go to school now.
　　You had better not go to school now.
　　五、句中有不定代词all , both , everybody , everything的，如变为完全否定句，both要变为neither、all要变为none、everybody要变为nobody、everything要变为nothing。如：
　　of us are at school.
　　Neither of us is at school.
　　of them are playing basketball now.
　　None of them is playing basketball now.
　　likes watching TV.
　　Nobody likes watching TV.
　　know everything about you.
　　I know nothing about you.
　　六、句中有频度副词always的，变完全否定句时，要把always改为never。如：
　　always gets up at 10 o"clock on Sundays.
　　He never gets u