Every so often : মাঝে মাঝে; থেকে-থেকে;
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Appropriate Prepositions
Affectionate to(স্নেহশীল): He is very affectionate to his baby.
Argue over (কোন বিষয়ে তর্ক করা): The kids are arguing over which TV program to watch.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Hope for (আশা করা): Let us hope for the best.
Indifferent to (উদাসীন): Everybody is indifferent to my problem.
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Idioms
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Fair and square (সৎ): The learned persons should be fair and square.
For good (চিরদিনের জন্য): He left the house for good.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
To the point (সঠিক) - The boy answered the question to the point.