Read each pattern and its example, then write your own sentence on the line.
〜一方で V-dict / い形 / な形-な・である / N-である + 一方で
Presents two contrasting sides of the same situation or person: 'on one hand …, on the other …'. Written and formal-leaning; frequent in essays and news.
都会の人口が増える一方で、地方では過疎化が進んでいる。 While city populations grow, rural areas are becoming depopulated.
〜反面 V-dict / い形 / な形-な・である / N-である + 反面
Points out an opposite quality of the same thing: 'X, but on the other side of it, Y'. Used mainly for evaluating merits and demerits; slightly written in tone.
この仕事は給料がいい反面、休みが少ない。 This job pays well, but on the other hand there are few days off.
〜に反して N + に反して（名詞修飾は N に反する N）
Says the result went against an expectation, prediction or rule. Formal and mostly written; the noun before it is usually 予想・期待・予報・命令.
予想に反して、試合はあっさり終わった。 Contrary to expectations, the match ended quickly.
〜に比べて N + に比べて（に比べ）
Introduces a standard of comparison: 'compared with X'. Neutral in register and used freely in both conversation and writing; に比べ is the shorter written form.
去年に比べて、売り上げが二割増えた。 Compared with last year, sales rose by twenty percent.
〜かわりに N + の / V-dict / V-た + かわりに
Means doing one thing instead of another, or giving something in exchange for something else. Everyday register, used in both speech and writing.
部長のかわりに、私が会議に出ました。 I attended the meeting in place of the department head.
〜に代わって N + に代わって（に代わり）
Means acting on behalf of someone, or one thing replacing another over time. More formal than 〜のかわりに and common in announcements and written Japanese.
社長に代わって、副社長があいさつをした。 The vice president gave the greeting on behalf of the president.