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
Anxious for (কারোর ব্যাপারে চিন্তিত): Sabbir was anxious for her.
Consent to(মত দেওয়া): My father did not consent to the proposal of my sister’s marriage.
Convert to(দীক্ষিত): Tom is converted to another religion.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Similar to (সদৃশ): My T-shirt is similar to yours.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Lump sum (এক কালীন) — He gave us lump sum money.