Whilst : যখন, যতক্ষণ না;
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Appropriate Prepositions
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Comply with(মেনে নেওয়া): The clerks must comply with the orders of their officer.
Contribution to (অবদান): His invention made a major contribution to road safety.
Greed for (লোভ): He has an indomitable greed for wealth.
Heir of (উত্তরাধিকারী): He is the heir of his father.
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Idioms
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.