At times : সময়ে সময়ে; মাঝে মাঝে; কখন কখন; কখন-সখন; কখনত্ত কখনত্ত;
Related Words
at the most  at times  atomies  atoms  attains  attimes  attunes  See Words Also In
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Appropriate Prepositions
Attentive to(মনোযোগী): He is attentive to his business.
Consent to(মত দেওয়া): My father did not consent to the proposal of my sister’s marriage.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Solution to (সমাধান): None can solution to every problem.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.