Keep an eye on : নজরে রাখা; নজর রাখা; চক্ষুয় রাখা; চক্ষু দেত্তয়া;
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keep an eye on  keep on  See Words Also In
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Appropriate Prepositions
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Delighted at/with (আনন্দিত হওয়া): Sharmin was delighted at/with her husband’s promotion.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Faith in (বিশ্বাস): I have no faith in him.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
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Idioms
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
To the point (সঠিক) - The boy answered the question to the point.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.