Retrospective effect : ভূতাপেক্ষ কার্যকরতা;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Contribution to (অবদান): His invention made a major contribution to road safety.
Sentence to, for (দন্ডাদেশ দেওয়া): He was sentenced to death for murder.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.