Keep at : লেগে থাকা; চালিয়ে যাওয়া; ছেড়ে না দেওয়া;
Related Words
keep at  keep out  keep up with  keepout  kept  See Words Also In
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Appropriate Prepositions
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Business with (ব্যবসা, কাজ): He is pleased to do business with you.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Married to (বিবাহিত): Salma was married to a Govt. Officer.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
To the point (সঠিক) - The boy answered the question to the point.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.