In the course of : চলা কালে; ব্যাপিয়া;
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in the course of  in the course of time  See Words Also In
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Appropriate Prepositions
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Count upon(নির্ভর করা): He always counts upon your help for this work.
Look for (খোঁজা): I was looking for the lost phone.
Look into (তদন্ত করা/অনুসন্ধান করা): I am looking into the matter.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
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Idioms
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Pick a quarrel (ঝগড়া করা)—Do not pick a quarrel.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.