Some times : কখন কখন; কখনত্ত কখনত্ত; কখন-সখন; কখনো সখনো;
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some times  something  something else  sometimes  See Words Also In
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Appropriate Prepositions
Abide with(সঙ্গে থাকা): If you would like to rest for a while, you can abide with me.
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Annoyed with(ব্যক্তির সাথে বিরক্ত হওয়া): I am annoyed with him.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Quarrel over (কোন বিষয়ে ঝগড়া করা): Do not quarrel over this trifling matter, let it be drop.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
All in - (পরিশ্রান্ত): I was all in after the meeting.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
On the wane (হ্রাসমান): His fame is on the wane now.
To the point (সঠিক) - The boy answered the question to the point.