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
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Arrange for(ব্যবস্থা করা): We have arranged everything for our study tour.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Yield to (নতি স্বীকার করা): I shall not yield to his temptation.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Now and then (মাঝে মাঝে): He comes here now and then.
To the point (সঠিক) - The boy answered the question to the point.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.