By chance : কপালজোড়ে; দৈবাৎ; দৈবক্রমে; ঘটনাক্রমে; অদৃষ্টক্রমে; হঠাৎ;
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Appropriate Prepositions
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Fit for (যোগ্য): Sabina is not yet fit for marriage.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
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Idioms
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.