他们住在这所房子是很危险的．　英语怎么说?

the house is very dangerous which they are living in
或者
the house,which they are living in,is very dangerous
或者
they are living in a very dangerous house
以上表示他们住在一个很危险的房子
以下是他们住在这个房子是一个很危险的行为
it is very dangerous for them to live in this house
或者
living in this house is very dangerous for them

It is very dangerous for them to live in this house.
没有dangerous的房子
是住在里面很dangerous

The house they live in is very dangerous. 重点是说那个房子很危险。
如果说住这个房子里会对给他们带来危害的话，那就写 It is dangerous for them to live in this house.

the house in which they live is rather dangerous

Very dangerous is the house they live in.

In a very dangerous condition is the house that they live in.