In theory : ধারণায়;
Related Words
in another way  in other words  in ter com  in tern  in the air  in the red  in the round  in the world  in theory  in turn  initiatory  inter  intercessory  interim  intermarry  intern  internally  interne  interns  interplay  inters  interse  See Words Also In
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Appropriate Prepositions
Call on(কারও সাথে দেখা করা): I called on him in his office.
Cope with (এঁটে ওঠা; তাল মিলিয়ে চলা): They cannot cope with so much work.
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.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
Shout at (চিৎকার করে ডাকা): Do not shout at your parents.
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Idioms
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.