1个非三单句子要2肯2否

My father is watching TV.
Jim is reading in his room.
I'm doing my homework.
They are swimming in the river.
He comes from America.
Does he come from America
He comes from America,doesn't he
Where does he come from
He doesn't from America.
Lucy is good at math.
Is Lucy good at math
Lucy is good at math ,Isn't she
What subject is Lucy good at
Lucy isn't good at math.
My father does a little housework at home.
Does your father do a little housework at home
My father does a little housework at home,doesn't he
What does your father do at home
My father doesn't do a little housework at home.
My friends are friendly to me.
Are your friends friendly to you
My friends are friendly to me,aren't they
How are your friends
My frends aren't friendly to me.

以下情况作主语时 谓语用非单三：
they ,一切复数名词,we,you, the+Greens(格林一家人),




你的采纳 我的动力
希望我能继续帮你

你说的是英语中的人称吗?英语中的人称分为三类
1、第一人称：I we
2、第二人称：you（你）you（你们）
3、其它的都是第三人称,其中第三人称可分为单数,和复数.
即：第三人称单数和第三人称复数.
第三人称单数包括he it she 和可数名词的单数（如 an apple）和所有的不可数名词（water）
第三人称复数指可数名词的复数形式（如apples）
所谓的三单就是第三人称单数吧.
那么非三单就是：第一、第二、第三人称的复数这三类了.

主语为三单的句子：
1.My sister likes milk.
一般疑问：Does your sister like milk?
反意疑问句：My sister likes milk,doesn't she?
特殊疑问句：What does your sister like?
否定句：My sister doesn't like milk.
2.Tom does his homework every day.
一般疑问：Does Tom do his homework every day?
反意疑问句：Tom does his homework every day,doesn't he?
特殊疑问句：When does Tom do his homework?
否定句：Tom doesn't do his homework every day.
主语为非三单的句子：
3.We have a meeting on Tuesdays.
一般疑问：Do you have a meeting on Tuesdays?
反意疑问句：We have a meeting on Tuesdays,don't we?
特殊疑问句：When do you have a meeting?
否定句：We don't have a meeting on Tuesday.
现在进行时的句子：
The boy is flying a kite.(三单）
Jane is dancing under a big tree.(三单）
I am reading an English book.（非三单）
His parents are doing housework.(非三单）
我觉得没必要将主语是三单和非三单各造三个句子,因为相信你通过这几个句子就能明白怎样造了.

am ,is,are过去式was.were
have,has过去时had
do,does过去时did
主语第三人称单数
he,his.
she,her.
it,its.
主语第三人称
要三单一
但过去式除第一人称单数,第三人称
其余都用were

she can swimShe can't swim. Can she swim?she do well in englishShe doesn't do well in English.Does she do well in English?she is a teacherShe isn't a teacher.Is she a teacher?