Effectiveness : কার্যকারিতা;
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Appropriate Prepositions
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.