Guard against : আগে থেকে সাবধান হওয়া; সতর্ক থাকা; তাড়ান;
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Appropriate Prepositions
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
All along - (সব সময়): I was present in the meeting all along.
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.
Far and wide (সর্বত্র): His fame spread far and wide.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.
Worthy of (যোগ্য) - He is worthy of a good job.