Facultative : ঐচ্ছিক; স্বেচ্ছামূলক; আনুষঙ্গিক; অনুমতিমূলক;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Concerned with(জড়িত): She was concerned with such things.
Infested with (অতিষ্ঠ): The room is infested with rats.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
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Idioms
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
Of course (অবশ্যই): Of course, you know what that meant.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.