REP过期之后人必须一直在新加坡。

如果出境或者在外国，PR直接没了。

https://www.ica.gov.sg/reside/PR/apply-REP

“If you leave Singapore or remain overseas without a valid REP, you will lose your permanent residence status. If you enter Singapore without a valid REP, you would be deemed as a foreign visitor, subject to prevailing entry requirements.”

回来之后就算REP不给续，只要不出境，PR一直都在。

从来没遇到过。最多碰到过要entry permit那张黄纸。那是不一样的东西。