Learn 是 + N / S + 不是 + N and Possessive structure with 的 through People in the Family.
Examples
生男生女都一样。
Whether it's a boy or a girl, it's all the same.
女学生很多。
There are many female students.
Examples
她是一个好女人。
She is a good woman.
我的女人很漂亮。
My wife is very beautiful.
Examples
他是我男人。
He is my husband.
那个男人很高。
That man is very tall.
Examples
他是男生。
He is a male student.
她有一个男孩。
She has a baby boy.
Examples
他是我的儿子。
He is my son.
Examples
这个孩子很可爱。
This child is very cute.
我的孩子在上学。
My child is going to school.
Examples
我爷爷很老了。
My grandfather is very old.
他是老王。
He is Old Wang (a friendly form of address).
Examples
三天后我就回来。
I'll be back in three days.
他在后面。
He is behind.
Examples
我有一个妹妹。
I have a younger sister.
Examples
老人需要照顾。
Elderly people need care.
他是位老人。
He is an elderly person.
Examples
我有书。
I have a book.
Examples
我家有两口人。
There are two people in my family.
他们两个都是学生。
Both of them are students.
S + 是 + N / S + 不是 + NUse '是' (shì) to affirm identity, occupation, or relationship. Use '不是' (bú shì) to negate. This is the most basic structure for introducing yourself or others.
那个女人是我妈妈。
That woman is my mother.
他不是老人。
He is not an old man.
名词 + 的 + 名词（领属关系）Place '的' (de) after a noun referring to a person or thing to show possession or a relationship. For example: '妈妈的孩子' means 'mom's child'.
男人的孩子很小。
The man's child is very young.
这是妈妈的妈妈。
This is mom's mother.
Two children look at photos and talk about their families.
你好！这是你的家人吗？
Hello! Is this your family?
是，这是我妈妈。
Yes, this is my mom.
你妈妈很好看！后面的孩子是谁？
Your mum looks lovely! Who’s the child behind her?
那是我的妹妹。她还小。
That's my younger sister. She's still little.
哦，后面的老人是谁？
Oh, who is the elderly person behind?
那是我妈妈的妈妈。她今年八十岁。
That's my mom's mother. She's eighty this year.
那个男人是谁？
Who’s that man?
那是我爸爸。那个女人是我妈妈的妹妹。
That’s my dad. That woman is my mum’s younger sister.
你家有几个男的，几个女的？
How many males and how many females are there in your family?
两个男的，两个女的。爸爸和我是男的，妈妈和妹妹是女的。
Two males and two females. Dad and I are the men; Mum and my sister are the women.