Nuts and bolts : ব্যবহারিক খুঁটিনাটি;
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Appropriate Prepositions
Apply to (কারো কাছে আবেদন করা): He applied to the principal for free admission.
Careful of (সতর্ক): He is very careful of his fault.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Taste of (স্বাদ; অভিজ্ঞতা): They have had some taste of problems.
Worry about (কোনো কিছু বা কাউকে নিয়ে উদ্বিগ্ন হওয়া): Please, don’t worry about me. I will be alright.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.