A friend in need is a friend indeed : অসময়ের বন্ধু প্রকৃত বন্ধুই; বিপদের বন্ধুই প্রকৃত বন্ধু;
Related Words
a friend in need is a friend indeed  afriendinneedisafriendindeed  See Words Also In
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Appropriate Prepositions
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Convert to(দীক্ষিত): Tom is converted to another religion.
Covetous of(লোভী হওয়া): He is covetous of wealth.
Curse for (অভিশাপ দেয়া): If he ever mistreats my parents, I will certainly curse him for it.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
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.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.