Step sister : সৎবোন;
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Careful of (সতর্ক): He is very careful of his fault.
Conceal from(লুকানো) Do not conceal anything from me.
Fit for (যোগ্য): Sabina is not yet fit for marriage.
Make from (কোনো উপকরণ দ্বারা সরাসরি তৈরী নয় বোঝাতে): Paper is made from bamboo.
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Idioms
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
Man of letters (পন্ডিত ব্যক্তি): You are truly a man of letters.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.