To start with : প্রথমত; শুরুতে; আদিতে;
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Appropriate Prepositions
Abide in(বাস করা): I abide in Dhaka with my family.
Aware of(অবগত): I am not aware of his dishonesty.
Breakdown of (বিস্তারিত): Here is statistical breakdown of data.
Burdened with (ভারাক্রান্ত): Rahim is burdened with a big family.
Lost in (মগ্ন): Simon is lost in meditation.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Now and then (মাঝে মাঝে): He comes here now and then.
Set free (মুক্ত করা): The prisoners were set free.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.