Spontaneousness : স্বতঃস্ফূর্ততা; সাবলীলতা; স্বচ্ছন্দতা; সহজ ভাব;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Adept in (দক্ষ): He is adept in playing football.
Attain to (লাভ করা): He will not attain to his objective so soon.
Conscious of(সচেতন): I am conscious of my deficiencies.
Urge upon (আহবান জানানো): She urged upon his son the importance of being honest.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
At home (comfortable— আরাম) He feels at home in Dhaka now.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.