Harmonic series : বিপরীত শ্রেণী; বিপরীত শ্রেণি;
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Appropriate Prepositions
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Loyal to (অনুগত): Every citizen must be loyal to the state.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.