When you are comparing only two things, you must use the comparative construction of the adjective or adverb in question. When you are comparing three or more things, you must use the superlative construction instead. Since the example sentence only gives "student" and "teacher" as options the comparative construction must be used in this case. The best way to correct the underlined portion above is: "It's hard to know whether it is more difficult to be a teacher,"

When you are comparing only two things, you must use the comparative construction of the adjective or adverb in question. When you are comparing three or more things, you must use the superlative construction instead. Since there are usually at least three "members of [a] band," and musical partnerships are referred to as duos rather than band's, it is correct to use the superlative construction in this instance. The best way to correct the underlined portion above is: "Johnny is the most charismatic member of the band;"

Note that a semicolon correctly separates these two independent clauses.

When you are comparing only two things, you must use the comparative construction of the adjective or adverb in question. When you are comparing three or more things, you must use the superlative construction instead. The best way to correct the underlined portion above is: "Which of the heroes do you think is greater"

When you are comparing only two things, you must use the comparative construction of the adjective or adverb in question. When you are comparing three or more things (or an indefinite number of things), you must use the superlative construction instead. The best way to correct the underlined portion above is: "Gunter is the strongest by far."

"Of all" is a reliable indicator that the superlative construction will be needed.

Adjectives describe nouns, and adverbs describe verbs, adjectives, or other adverbs. Always ensure that you are using the correct one for describing a particular word. The best way to correct the underlined portion of the sentence above is: "Ada is nicer in general than Francisca, but Francisca treats children more kindly."

When you are comparing only two things, you must use the comparative construction of the adjective or adverb in question. When you are comparing three or more things, or an indefinite number of things, you must use the superlative construction instead. The best way to correct the underlined portion above is: "What do you think is more difficult: tactics or strategy?"

Note that while "tactics" and "strategy" are sometimes used synonymously, this is not accurate. "Tactics" refers to specific techniques used to deal with situations or techniques, while "strategy" refers to the overall plan for dealing with a situation. "Tactics" deal with minutiae, while "strategies" deal with large-scale plans and concepts.

When you are comparing only two things, you must use the comparative construction of the adjective or adverb in question. When you are comparing three or more things (or an indefinite number of things), you must use the superlative construction instead. In this case, no other item is named, so we can assume that "fried chicken" is being compared to all other food options, in terms of healthiness. The best way to correct the underlined portion above is: "but it certainly isn't the healthiest thing to eat."

When you are comparing only two things, you must use the comparative construction of the adjective or adverb in question. When you are comparing three or more things, you must use the superlative construction instead. The best way to correct the underlined portion above is: "that Nicki is the better artist."

Note that the introduction of one other item directly affects the grammar of the rest of the sentence. It would be perfectly grammatically correct to say, "In my heart of hearts I know that Nicki is the best artist." But, once an introductory clause has been used that discussed Nicki in conjunction with "Taylor Swift" a comparative structure becomes necessary.

When you are comparing only two things, you must use the comparative construction of the adjective or adverb in question. When you are comparing three or more things, or an indefinite number of things, you must use the superlative construction instead. Since the group of enemies is described as a "gallery" we know that there are many, certainly more than two, enemies to which the "Humorous Prankster" is being compared. The best way to correct the underlined portion above is: "the Joker is by far the most dangerous."

When you are comparing one thing to only one other thing, you must use the comparative construction of the adjective or adverb in question. When you are comparing three or more things, or an indefinite number of things, you must use the superlative construction instead. Superlatives distinguish one item from many others in one particular aspect. Comparatives directly compare one item to only one other item. The best way to correct the underlined portion above is: "but Richard is more honorable than him."

Note that since the second clause provides information that contradicts the sentiment of the first clause "but" rather than "or" is the correct conjunction.