Here's the sitch: for "Hij is de enige jongen." You use the -e ending, right. And boy is a singular verb. So why isn't that applicable to enkel?
It has nothing to do with a noun being singular or plural. You need to know if the noun is a 'het woord' or a 'de woord'. All 'de' words (wether you use 'de' or 'een') have an '-e' ending for the adjective. If the noun is a 'het' word, there're two options. If 'het' is used, the adjective gets the '-e' ending. If 'een' is used, the adjective does not get the '-e' ending. (For 'enkel' it's a bit tricky, because you can't use 'enkel' with 'de' or 'het'.)
- Een enkel bord
- Een enkele jongen
Yet it's worth noting plurals are always 'de' so plural will be always preceded with -e and only in singular you need to stretch your memory if it's 'het' or 'de' ;-)
excuse me, How to have "Het" and "De" words in a list? Any link?? thank you.