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
Covetous of(লোভী হওয়া): He is covetous of wealth.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Fed up with (বিরক্ত): He is fed up with waiting for her.
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
Welcome to (স্বাগত জানানো): You are welcome to our new office.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.
Short temper (রগচটা)— He is a man of short temper.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.