Once upon a time : এককালে; একদা; পূর্বে কোন একসময়ে;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Acquit of (অব্যাহতি দেয়া): The chief justice acquitted him of the charge of murder.
Change into (পরিবর্তিত হওয়া): At what point does boiling water change into vapor.
Competent for(যোগ্য): He is not competent for the post.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Run short (কমতি পড়া) —I ran short of money.
Set free (মুক্ত করা): The prisoners were set free.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.