Passive voice means that the subject in a sentence is the receiver of the action. Active voice is when the subject in a sentence is the doer of the action.

Grammar is the set of rules that are to be followed while speaking or writing in a language. Vocabulary means all the words known and used by a person in a particular language.

A pronoun is a word that is used to substitute a noun in a sentence. Proper nouns are the names of specific entities such as the names of people, places, etc.

The alphabets a, e, i, o, and u are called as vowels in the English language. Consonants are all the other alphabets of the English language, except the vowels.

A noun is a word that is used to identify people, places, objects, happenings, etc. An adverb is a word which is used to describe a verb, an adjective or a sentence.