Mainspring : মুখ্য উদ্দেশ্য; ঘড়ির প্রধান চালক-স্প্রিং;
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Appropriate Prepositions
Argue over (কোন বিষয়ে তর্ক করা): The kids are arguing over which TV program to watch.
Behave towards(ব্যবহার করা): The students behaved objectionably towards the Head teacher.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Detrimental to (অপকারী): Smoking is detrimental to health.
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Idioms
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
Round the clock (সমস্ত দিন): He is working round the clock.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.
Without fail (অবশ্যই) - You must attend the meeting without fail.