I just saw the following two sentences:
У мальчиков есть вода.
У мальчиков нет воды.
It seems that the meaning is something like The children have water. and The children don't have water.. However, why do the two sentences use different forms of
воды? (I don't know the proper form of those words, but maybe
вода is the proper and
воды is the plural form of it?) But then I'm not sure why the latter uses plural form...
What makes these two words different?
By the way is there any good dictionary to list all the conjugated forms of a noun? I searched both
воды and then got results in both times, but I even can't see which is the proper form!