Confirmation letter : অনুমোদনপত্র; সমর্থনপত্র;
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Appropriate Prepositions
Call on(কারও সাথে দেখা করা): I called on him in his office.
Cause of(কারণ): Industry is the cause of your success.
Feed with (কোনো কিছু খাওয়া): They feed the cow with grass.
Noted for (বিখ্যাত): She is noted for dancing.
Play at (খেলা): I do not play at cards.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.