1.如果PR过期了而且已经离开了新加坡,不在续PR的情况下必须卖出HDB吗?
yes, you have to sell it...
2.是不是在各种年限下关于1的处理情况不一样呢?
HDB will question you: If you are no longer 'permanent resident' in s'pore, why you need the HDB house? If you just want investment, go private...
3.万一要离开新加坡房贷还没还清大家都打算怎么处理啊?
Keep PR status, rent out the unit, rental to cover loan...