Nullify : রদ করা, নিষ্ফল করা
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Appropriate Prepositions
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Informed of (অবহিত): I was not informed of your misfortune.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
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Idioms
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Crying need (জরুরী): Mass education is a crying need for India.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.