Question

they are talking about their homework(改为否定句)？

Answer 1

They are talking about their homework.的否定句是They are not talking about their homework.

说明：are talking是现在进行时，即Be动词+现在分词。只需在be动词后面+not，即可变成否定句。又如：

肯定句：He is reading a book.

否定句：He is not reading a book.

Answer 2

they are talking about their homework.他们正在讨论家庭作业。这里有be动词are,直接在are后面加一个not就变成了否定句。

they are not talking about the homework他们不是正在讨论家庭作业。

Answer 3

They are talking about their homework

他们正在谈论他们的作业

改为否定句

就是

Negative sentence

They are not talking about their homework

Answer 4

They are not talking about their homework.

进行时态的否定句直接在助动词be的后面加not

Answer 5

they are not talking about their homework.
一般现在时：（1、现在的状态。2、经常或习惯性动作。3、主语所具备的性格和能力。4、真理。）
1、标志：often（经常）,usually（通常）,sometimes（有时）,always（总是）,never（从不）,
on Sundays（在星期天）, every day/month/year（每一天/月/年）
2、结构：
（1）主语+连系动词be(am/is/are)+名词/形容词/数词/介词短语/副词等做表语表状态。
（2）主语（非第三人称单数）+行为动词原形+其他 （用助动词do 帮助构成否定句、一般疑问句和特殊疑问）
（3）主语（第三人称单数）+行为动词的第三人称单数+其他（用助动词does 帮助构成否定句、一般疑问句和特殊疑问句）
行为动词第三人称单数加-s的形式
1.- s
2. 辅音+y: study-studies
3.以s,x,ch,sh结尾watch-watches  teach-teaches
4特殊have-has do-does go-goes