Essential service : অত্যাবশ্যক কৃত্যক;
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Appropriate Prepositions
Business with (ব্যবসা, কাজ): He is pleased to do business with you.
Complain about (কোনো বিষয়ে নালিশ করা): They complained about the mismanagement of the programme.
Count for(গণ্য বা বিবেচিত হওয়া): There can be no lasting peace without true democracy in which the people play a part and count for something.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.