无家可归

In a sentence

• 许多无家可归的人住在临时的庇护所中。

  Many homeless individuals live in temporary shelters.

  Here, '无家可归' is used as an adjective describing 'people' ('许多...人'). It emphasizes the state of lacking a home.

• 是否有政府机构正在帮助那些无家可归的人？

  Are there government agencies assisting those who are homeless?

  In this sentence, '无家可归' acts as an adjective modifying 'people' ('那些...的人'), asking about aid for homeless individuals.

• 无家可归是一种严重的社会问题，需要更多的关注与解决方案。

  Homelessness is a serious social issue that requires more attention and solutions.

  Here, '无家可归' is used as a noun, referring to the concept or state of homelessness as a broader issue.