To identify the parts of speech, we need to understand the role each underlined word plays in the sentences. Here is an explanation for each:
Sentence: You will pass if you work hard. Part of Speech for 'if': 'if' is a conjunction because it connects the two clauses, allowing one to be dependent on the other.
Sentence: The boy was dismissed from service because of misbehaviour. Part of Speech for 'because': 'because' is a conjunction as it introduces the reason clause for the action.
Sentence: My uncle sold his house to a millionaire. Part of Speech for 'to': 'to' is a preposition as it indicates the relationship between 'house' and 'millionaire'.
Sentence: He generally avoids bad companions. Part of Speech for 'generally': 'generally' is an adverb because it modifies the verb 'avoids', describing how often the action takes place.
Sentence: This is the oldest house in Mumbai. Part of Speech for 'oldest': 'oldest' is an adjective as it describes the noun 'house'.
Sentence: Human and animal waste cause pollution. Part of Speech for 'and': 'and' is a conjunction, joining the two nouns 'human' and 'animal'.
Sentence: All work and no play makes Jack a dull boy. Part of Speech for 'makes': 'makes' is a verb as it denotes an action performed.
Sentence: This is the beggar who stole my wallet. Part of Speech for 'who': 'who' is a pronoun as it introduces the relative clause.
Sentence: Ambition, optimism and stamina keeps people going. Part of Speech for 'optimism': 'optimism' is a noun; it represents an idea or concept.
Sentence: Everyone at the party last night was wearing a pirate costume. Part of Speech for 'costume': 'costume' is a noun, referring to an item of clothing.
Sentence: They build large nests in trees or the walls of cliffs. Part of Speech for 'or': 'or' is a conjunction, offering a choice between 'trees' and 'walls'.