Facultative : ঐচ্ছিক; স্বেচ্ছামূলক; আনুষঙ্গিক; অনুমতিমূলক;
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Appropriate Prepositions
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Composed of(তৈরী): This medicine is composed of vitamins and minerals.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Cope with (এঁটে ওঠা; তাল মিলিয়ে চলা): They cannot cope with so much work.
Damage to (ক্ষতি): The flood caused much damage to crops last year.
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Idioms
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.