Most modern Scots plurals are formed by adding -s or -es. Older Scots usually has -is or -ys.
Other forms include the addition of -en which is still used in English oxen and survives in Scots: ee, plural een.
Many nouns form their plural by changing the vowel: coo, plural coos or kye fit, plural feet wumman, plural weemen
Some nouns even combine plural markers: shae, plural shuin (or North sheen) where we see an -(e)n plural combined with a vowel change.
Words ending in -f or -fe form a plural by adding -s (not changing to -ves, as in English): Yon plant's near lost aw its leafs; We're needin mair shelfs for aw thae buiks.
Sometimes singular nouns can refer to more than one thing: Wid ye like a tattie tae yer tea? She brocht a flooer tae the hospital.
Words referring to measurements or amounts, such as inch, fit/foot, mile, pund/pound, year, don't change their ending in the plural, eg twa mile, ten pund, fower year. But NB, day changes to days: Ah wis aff three days wi the flu.
Words referring to amounts of something come immediately before the noun they refer to (without an o), eg a bit breid, a drap watter.