their + noun
Their house is big.
他们的房子很大。
他们的；她们的；它们的
Belonging to or associated with people or things previously mentioned or easily identified.
他们的
pron. & a. The possessive case of the personal pronoun they;；as, their houses; their country.
The students handed in their homework before the deadline.
学生们在截止日期前交了他们的作业。
用法提示：their 是物主限定词，表示“他们的”，修饰 homework，说明作业属于学生们。
The family packed their bags for the trip.
这家人为旅行收拾好了他们的行李。
用法提示：their 表示“他们的”，修饰 bags，表明行李属于这家人。
People should check their tires before driving.
人们开车前应该检查他们的轮胎。
用法提示：their 表示“他们的”，修饰 tires，泛指每个人的轮胎。
Their house is big.
他们的房子很大。
They have their own car.
他们有自己的车。
One of their friends is a doctor.
他们的一个朋友是医生。
their是限定词，后接名词；theirs是代词，独立使用
grammar · medium
易错句子The students left there books on the desk.
正确表达The students left their books on the desk.
“their”是“他们的”，表示所有格；“there”指地点“那里”。此处需用所有格，因此应使用“their”。
grammar · medium
易错句子They're going to they're house after school.
正确表达They're going to their house after school.
“they're”是“they are”的缩写，而“their”是所有格。句中需要所有格修饰“house”，故用“their”。
there 表示地点或存在，与所有格 their 音同形异，常用于指代位置或“存在”结构。
they're 是 they are 的缩写，表“他们是”，与所有格 their 音同形异，注意主谓结构。
他们自己的
They have their own car.
他们有自己的车。
他们的父母
Their parents are very supportive.
他们的父母非常支持。
他们的孩子
Their children go to the local school.
他们的孩子上当地的学校。
他们的房子
Their house is on the corner.
他们的房子在拐角处。
他们的眼睛
Their eyes were full of tears.
他们的眼里充满了泪水。
他们的声音
Their voice is loud and clear.
他们的声音响亮而清晰。
常与'their'连用表示家庭
'their home'指他们的住所
'their friends'指他们的朋友
'their parents'指他们的父母
'their children'指他们的孩子
他们的劫数到了
After the boss found out about the mistake, he knew their number was up.
老板发现那个错误后，他知道他们的劫数到了。
他们完蛋了
If they don't finish the report on time, their goose is cooked.
如果他们不按时完成报告，他们就完蛋了。
他们的另一半
She is out with her better half tonight.
她今晚和她的另一半出去了。
Dictionary facts from AI_FALLBACK, ECDICT, WIKTIONARY.