The identification Proper Nouns and Common Nouns are;
1.Mrs Pradhan(Proper Nouns )
2.parents, watch(Common Nouns) Sakshi(Proper Nouns)
3.St Xavier's School(Proper Nouns) Proper Nouns(Common Nouns)
4. Sonal, Churchgate(Proper Nouns) friend(Common Nouns)
5. Mukesh, Govinda, Goa, Saturday(Proper Nouns)
What is common and 'Proper Nouns?
Common nouns refer to generic objects (such as "a city" or "a mountain"), whereas proper nouns refer to particular, named objects (such as "Chicago" or "Mt. Kilimanjaro").
Common nouns are capitalized exclusively at the beginning of phrases; proper nouns are capitalized consistently.