Collectives are nouns that refer to a group of individuals or things regarded as a unit. For example, 'swarm' refers to a group of bees, and 'flock' refers to a group of sheep.
Understanding the correct plural and singular forms of nouns is fundamental in English. Some nouns have irregular plural forms, such as 'child' becoming 'children', and 'knife' becoming 'knives'.
It's important to learn these collective nouns and plural/singular noun forms to enhance vocabulary and understanding of the English language, which can be significantly helpful in reading comprehension and writing tasks.