新加坡公民可以把自己买的HDB出租出去，然后自己租别的HDB住吗？

可以的小弥留之际

有条件Tenancy and property ownership status
Tenants must not be tenants of public rental HDB flats or owners of other HDB flats unless they are:

Divorced/ legally separated. In this case, only 1 party can rent a HDB flat from another flat owner
Owners who are eligible to rent out their whole flat. However, they must rent out their own flat within a month after they have rented an HDB flat from another flat owner

按法律需要住五年先，五年之内不能整租出去，万分要租需要留个房间而且租和自住的话房产税不一样