Count nouns have a singular (יחיד) and a plural (רבים) form.
a doctor an apple, an elephant, an igloo, an orange, an umbrella
some doctors, some apples, some oranges, some umbrellas
Non-count nouns do not have a plural form. However, some can come before a non-count noun.
some tea, some cheese, some milk, some air
USE ANY INSTEAD OF SOME IN NEGATIVE (-) AND QUESTIONS (?)
+ There are some kids in the class.
- There aren't any kids in the class.
? Are there any kids in the class?