Trial and error method : শুদ্ধাশুদ্ধি প্রণালী;
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Appropriate Prepositions
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Inferior to (নীচু/হীন): He is inferior to his neighbor.
Qualified for (যোগ্য প্রতিপন্ন হওয়া): No candidate was properly qualified for the post.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.