Obligatory : বাধ্যতামূলক, অবশ্যকরণীয়
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Appropriate Prepositions
Angry for (কোন কাজে রাগান্বিত হওয়া): Rahim was angry with me for my having done this.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Devoted to (মনোযোগী): He is devoted to music.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Free from (মুক্ত): He is now free from danger.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Base born (নীচ বংশজাত, খারাপ জাত—adj.) He is a base born person; I cannot go along well with him.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.