Grammar

'Campaigning' is a verb in present continuous tense ('are campaigning'). The '-ing' form with 'are' shows ongoing action. They are actively working to save the area from development.

'Capped' is a verb in past participle form (used in present perfect 'has had'). It means covered or fitted with a cap. The action was done to his teeth, making 'capped' the past participle of the verb 'cap'.

The word 'calm' describes the noun 'voice' by telling us what quality it has. Adjectives modify nouns, and here 'calm' modifies 'voice' by stating its emotional state (composed, peaceful).

'Calls' functions as a noun here because it's the object of 'has' and can be counted (five calls). It refers to scheduled visits/house calls the doctor must make, not the action of calling someone.

'Abhorrent' means disgusting or detestable, and it describes the quality of racism. Words that describe qualities or modify nouns are adjectives. 'Abhorrent' modifies 'racism' (a noun), so it's functioning adjectivally here.

 In the context of the sentence, the word abandon is a noun.

'Appalling' describes the quality of the conditions (meaning shocking or terrible). Since it modifies the noun 'conditions', it functions as an adjective. Adjectives describe what kind, which one, or how many about nouns.

 Ab initio in the context of the sentence is an adverb because it is describing the beginning or initiation of the agreement.

'Abide' in this context means to tolerate or endure, which is an action. Words that express actions or states are verbs. 'Can't abide' means cannot tolerate, showing that 'abide' functions as the main verb in this sentence.

'Ability' names a skill, capacity, or potential. Words that name things, ideas, or qualities are nouns. Here 'ability' names the capability to relax, which is clearly functioning as a noun (it follows 'your', a possessive determiner).

'Ablaze' describes the state or condition of the trees (meaning on fire or glowing brightly). Words that describe states or qualities are adjectives. Here it modifies 'trees' through a linking verb 'were', functioning as a subject complement.

'Able' describes the quality or capability of 'you' (meaning capable or skilled). Words that describe qualities or states are adjectives. 'Able' modifies 'you' and is followed by an infinitive ('to speak'), typical of adjectives expressing capability.

The word 'about' connects 'nothing' with 'it' as a preposition showing relationship. It cannot be a noun (no thing named 'about'), verb (no action), or adverb/adjective (no modifying function). Prepositions like 'about', 'over', 'with' show relationships between words.

'Accusative' is a noun naming a grammatical case (like 'nominative', 'dative'). In the sentence, 'him' is indeed a pronoun in the accusative case, but the bold word 'accusative' itself functions as a noun (the name of the case). The answer key correctly identifies the part of speech of the bold word.

'About' modifies 'best' (an adjective functioning as a noun phrase) as an adverb of degree. It means 'approximately' or 'around'. Adverbs modify adjectives, and here 'about' tells us to what degree something is 'the best' - roughly or approximately. It cannot be a preposition (no object follows), verb (no action), or noun.