Pyranoses and Furanoses Bio chem question

[exacto]

Can aldehydes and ketones ( hexoses and pentoses) both become pyranoses and furanoses?

It looks like only aldehhexoses such as glucose can form pyransose rings and only ketohexoses such as fructose can form furanose rings?Am i correct?

Or what sugars can form into the 5 or 6 member rings???

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[Cawolf]

Aldoses and ketoses, both pentose and hexose, can all form both pyranoses and furanoses. One form will be more favored at equilibrium depending on the sugar.