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
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Attention to(মনোযোগ): He has no attention to his studies.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Of course (অবশ্যই): Of course, you know what that meant.
Pass sth/sb off as sth/sb (মিথ্যা পরিচয় দেয়া; Pretend – ভান করা): They were trying to pass off these shirts as genuine Armani.
Show good manner (ভালো আচরণ প্রদর্শন ): You should show good manner in the company of young ladies.