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
Crave for(আকাঙ্ক্ষা করা): Everyone craves for care.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Indulge in (আসক্ত): You should not indulge in social media.
Satisfied with (সন্তুষ্ট): The authoress was highly satisfied with Jerry.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.