Explanations:Proper nouns are specific names of people, places, or things. They are always capitalized in a sentence. In the sentence "We went to Mumbai by train," the word "Mumbai" is a proper noun because it is the name of a specific city in India. Proper nouns are distinct from common nouns, which refer to general things, people, or places and are not capitalized unless they start a sentence.
Let's break down the sentence to understand the roles of each word:
"We" is a pronoun, which is a word used in place of a noun. Pronouns are not capitalized unless they start a sentence. In this case, "We" is capitalized because it is the first word of the sentence.
"Train" is a common noun, which refers to a general object or concept. Common nouns are not capitalized unless they start a sentence or are part of a title.
"Mumbai" is a proper noun because it is the name of a specific city. Proper nouns are always capitalized, regardless of their position in the sentence.
Understanding the difference between proper nouns and common nouns is crucial for correct grammar and sentence structure. Proper nouns are capitalized to distinguish them from common nouns and to indicate their specific nature. This distinction helps in conveying precise information and maintaining clarity in written communication.