Grammar

A train is primarily a noun referring to a connected series of railway cars. While 'train' can be a verb (to teach or prepare), the noun form is the most common and fundamental meaning without additional context.

Expansion is a noun referring to the act or process of becoming larger or more extensive. It ends in '-sion,' a common noun suffix, and it names the process itself rather than describing an action.

An expedition is a noun referring to a journey or voyage undertaken by a group of people with a particular purpose. It names the event or journey itself, making it a noun.

Climatic is an adjective meaning 'relating to climate or weather patterns.' The '-ic' suffix and its function describing climate (a noun) clearly mark it as an adjective form.

Expensive is an adjective describing something that costs a lot of money. Adjectives describe qualities or characteristics, and this word describes the cost of items.

Credible is an adjective meaning 'believable or trustworthy.' It describes the quality of being able to be believed, which is a characteristic rather than an action or object.

Exotic is an adjective meaning 'originating from a foreign country' or 'strikingly unusual or strange.' It describes characteristics of things, places, or people.

An apparition is a noun referring to a ghostly figure or something that appears suddenly but cannot be explained. It names a supernatural entity or phenomenon, making it a noun.

An appendix is a noun referring to supplementary material at the end of a book or document, or an anatomical structure. It names a specific thing or body part, making it a noun.

Appease is a verb meaning 'to pacify or placate someone by acceding to their demands.' Verbs express actions, and this word describes the act of calming or satisfying someone.

A clinic is a noun referring to a medical facility or place where outpatient treatment is provided. It names a specific place or establishment, making it clearly a noun.

In this sentence, 'last' modifies the noun 'night' and specifies which night is being referred to. Adjectives modify nouns or pronouns by describing, identifying, or quantifying them.

From is a preposition that shows the relationship between 'come' and its starting point or origin. Prepositions show relationships between words in a sentence, often indicating direction, location, or time.

Is is a linking verb that connects the subject 'a thing of beauty' with the complement 'a joy forever.' Linking verbs express a state of being rather than an action.

Did is used here as a helping verb (auxiliary verb) to form a question in the past tense. It helps the main verb 'waste' but doesn't have meaning on its own in this context.