You mean from כתיב חסר to כתיב מלא,right ???
כלומר בלי ניקוד לעם ניקוד ???
If yes I don't think anybody for example in high school can do that perfectly..... It is very hard for nattive speakers to that but for forign speakers it's much easier because they study it in later time than nattive do.
Most Israelis can't "vowelize" properly. But, I suppose if you learn lashon well enough you'll know. There're certain rules you need to learn (which aren't that hard I think), but most people don't bother since you read without them most of the time. Interestingly enough, Ashkenazi jews who know ashkenazi pronunciation know how to vowelize properly most of the time.