Cooperating : সহযোগী;
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Appropriate Prepositions
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Regard for (সম্মান): Good boys have great regard for their teachers.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
On the wane (হ্রাসমান): His fame is on the wane now.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.