Complexities : জটিলতা;
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Appropriate Prepositions
Argue against (বিপক্ষে বলা): She argued against the bill.
Attend to(মনোযোগ দেওয়া): Please attend to my advice.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
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Idioms
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.