Retrospective effect : ভূতাপেক্ষ কার্যকরতা;
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Appropriate Prepositions
Convict of(দোষী সাব্যস্ত হওয়া): The accused person was convicted of the murder.
Greed for (লোভ): He has an indomitable greed for wealth.
Hope for (আশা করা): Let us hope for the best.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
Senior to (বয়সে বড়): He is senior to me by two years.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
In no time (শীঘ্র): He will finish the work in no time.
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.