They have to rent a new house改同义句 You can ask them for help if necessary.改同义句
问题描述：
They have to rent a new house改同义句 You can ask them for help if necessary.改同义句
答
They must rent a new house.
You can ask them to help you if necessary.要把rent和if necessary改成同义句if necessary可以改成：if it is needed或if you need to do so.rent可以改为lease