Sometimes : কখনো সখনো; কখন কখন; কখনত্ত কখনত্ত; কখন-সখন;
Related Words
some times  something  something else  sometimes  See Words Also In
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Appropriate Prepositions
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Greed for (লোভ): He has an indomitable greed for wealth.
Identical with (একই ধরণের): You are identical with your sister.
Run on (বিরতিহীন চলা): The bus is running on time.
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Idioms
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
To the point (সঠিক) - The boy answered the question to the point.
Take into account (বিবেচনা করা): Your activities should be taken into account.