Keep track of : গতিবিধির বিষয়ে ত্তয়াকিবহাল থাকা;
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Look after (দেখাশুনা): He looks after me.
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Idioms
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Pass sth/sb off as sth/sb (মিথ্যা পরিচয় দেয়া; Pretend – ভান করা): They were trying to pass off these shirts as genuine Armani.
Slow coach (অলস): You cannot expect much from a slow coach.
Up to (পর্যন্ত) - I have done the exercises up to page 40.