Bolt from the blue : বিনা মেঘে বজ্রাঘাত; সম্পূর্ণ অপ্রত্যাশিত জিনিস;
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Appropriate Prepositions
Agree with, on, to(একমত হওয়া): My father agreed with me on this point, but he did not agree to my proposal to set up a canteen.
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Independent of (স্বাধীন): They are independent of my health.
Loyal to (অনুগত): Every citizen must be loyal to the state.
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Idioms
For good (চিরদিনের জন্য): He left the house for good.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.