Obligatory : বাধ্যতামূলক, অবশ্যকরণীয়
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Angry for (কোন কাজে রাগান্বিত হওয়া): Rahim was angry with me for my having done this.
Catch at(ধরা): A drowning man catches at a straw.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Urge upon (আহবান জানানো): She urged upon his son the importance of being honest.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.