Quadrivalent : চতুর্যোজী;
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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.
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Business with (ব্যবসা, কাজ): He is pleased to do business with you.
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Hostile to (বিরোধী বা বিরূপ ভাবাপন্ন): Nobody is hostile to you.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Follow the footsteps of (পায়ে পায়ে অনুসরণ করা): People always follow the footsteps of some great man.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
On the whole (মোটের ওপর): On the whole, his conduct is good.