Crash course : একটি সংক্ষিপ্ত প্রশিক্ষণ বা শিক্ষাক্রম যেখানে দ্রুত সময়ে কোনো বিষয়ে প্রাথমিক বা মৌলিক শিক্ষা দেওয়া হয়; a short course that teaches a lot of basic information and facts in a very short time
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Appropriate Prepositions
Abide with(সঙ্গে থাকা): If you would like to rest for a while, you can abide with me.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Informed of (অবহিত): I was not informed of your misfortune.
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Idioms
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Pass sth/sb off as sth/sb (মিথ্যা পরিচয় দেয়া; Pretend – ভান করা): They were trying to pass off these shirts as genuine Armani.
Run short (কমতি পড়া) —I ran short of money.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
To the point (সঠিক) - The boy answered the question to the point.