When did it happen : এটা কখন ঘটেছে?;
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Appropriate Prepositions
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Meet with (হঠাৎ কোন কিছু হওয়া): Yesterday I met with an accident.
Play on (বাজানো): They play on the piano.
Remedy for (প্রতিকার): There is no remedy for cancer.
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Idioms
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.