Back and forth : আগে পিছে; এদিক ওদিক; সামনে পিছনে; এদিক ত্তদিক;
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Appropriate Prepositions
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Ask for (কোনো কিছু চাওয়া): Do not ask him for any help because he doesn’t like to help anyone.
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Lost in (মগ্ন): Simon is lost in meditation.
Quarrel over (কোন বিষয়ে ঝগড়া করা): Do not quarrel over this trifling matter, let it be drop.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.