Unnecessarily : অনাবশ্যকভাবে, অকারণে, খামাখা;
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Appropriate Prepositions
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
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Idioms
All along - (সব সময়): I was present in the meeting all along.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Breathe one’s last (decease, die- শেষ নিঃশেষ ত্যাগ করা, মরে যাওয়া) The man breathed his last in his native village.
Bird’s eye view - (ভাসা ভাসা দৃশ্য, হালকাভাবে দর্শন): We took a bird’s eye view of the scenery.
In the wake of (ঠিক পরে): Police came in the wake of the accident.