For one thing : একটা কারণ হল; একটি কারণে;
Related Words
for nothing  for one thing  fornothing  fronting  See Words Also In
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Appropriate Prepositions
Affection for(স্নেহ): She has a great affection for the child.
Consistent with(সামঞ্জস্যপূর্ণ): Your action is not consistent with your word.
Effect of (প্রভাব): The effect of corruption is very harmful for our society.
Infested with (অতিষ্ঠ): The room is infested with rats.
Solution to (সমাধান): None can solution to every problem.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.