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
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Loyal to (অনুগত): Every citizen must be loyal to the state.
Qualified for (যোগ্য প্রতিপন্ন হওয়া): No candidate was properly qualified for the post.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.