Object lesson : বিষয়গত পাঠ;
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Appropriate Prepositions
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Indulge in (আসক্ত): You should not indulge in social media.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Pick a quarrel (ঝগড়া করা)—Do not pick a quarrel.
To the brim (কানায় কানায়) - The river was full to the brim.
Three score (ষাট): He is happy as his brother got three score.