Structural formula : সংযুতি-সংঙ্কেত;
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Appropriate Prepositions
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Due to (কারণে): His absence is due to illness.
Infested with (অতিষ্ঠ): The room is infested with rats.
Informed of (অবহিত): I was not informed of your misfortune.
Loyal to (অনুগত): Every citizen must be loyal to the state.
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Idioms
In vogue (চালু): This custom is not in vogue at present.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.
Well off (স্বচ্ছল) - Jim and Della were not well off.