Unpredictable : অনির্দেশ্য; অনিশ্চিত; যার সম্বন্ধে আগে থেকে বলা যায় না;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Attend to(মনোযোগ দেওয়া): Please attend to my advice.
Change into (পরিবর্তিত হওয়া): At what point does boiling water change into vapor.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Repent on (নির্ভরশীল): He is repent on his parents.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.
Sheet anchor (শেষ আশ্রয়; প্রধান অবলম্বন; আসল খুঁটি)— This small piece of land is his sheet anchor.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.