Irreplaceable : অপূরণীয়;
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Appropriate Prepositions
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Devoted to (মনোযোগী): He is devoted to music.
Enter into (আলোচনা করতে আরম্ভ করা): Let’s not enter into details at this stage.
Good for, at (ভাল): This man is good for nothing. He is good at English.
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Idioms
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
In no time (শীঘ্র): He will finish the work in no time.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.
Well off (স্বচ্ছল) - Jim and Della were not well off.