Obligatory : বাধ্যতামূলক, অবশ্যকরণীয়
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Appropriate Prepositions
Adequate to(সমানুপাতিক): The salary, he gets, is not adequate to the volume of work he has to do.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Sorry for (দুঃখিত): He is sorry for his misdeeds.
Taste of (স্বাদ; অভিজ্ঞতা): They have had some taste of problems.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
In the long run (পরিণামে): You will have to suffer in the long run.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.