They didn't go to Beijing.
现在时: They like English.
They don't like English.
一般将来时:形式一：They are going to play football.
They are going to play football.
形式二：They will play football.
They will not play football
现在进行时:They are playing football.
They are not playing football.
以上所有时态的例句中，前一句是肯定句，后一句是否定句。
否定句：I didn't read a book last night.
现在时：肯定句：I am in the room.
否定句：I am not in the room.
一般将来时：肯定句：I will go to Beijing.
否定句：I won't go to Beijing.
现在进行时：肯定句：I am cleaning the floor.
否定句：I am not cleaning the floor.
肯定.I worded in a school.
否定.He didn't study hard.
现在时：
肯定.I am a student.
否定.She isn't my sister.
一般将来时：
肯定.I will go home next week.
否定.He won't be a doctor.
现在进行时：
肯定.I am reading a book.
否定.They aren't swimming.
过去时现在时一般将来时现在进行时的肯定句否定句的例子
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一般过去时：S+V(过去式）+O eg: I did my homework.一般将来时：S+be going to +V(原型）+O e.g: I am gong to do my homework.= I will do my homework.现在完成时：S+have\/has +v（过去分词）+O eg: I have done my homwork.疑问句时将动词提前就可以了。如：do you......
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③一般疑问句：Had+主语+过去分词+其他 肯定回答：Yes,主语+had 否定回答：No,主语+hadn't ④特殊疑问句：特殊疑问词+一般疑问句（had+主语+过去分词+其他）如：I had been at the bus stop for 20 minutes when a bus finally came.过去进行时：表示过去某时正在进行的动作(不强调是否完成）如...
