External angle : বহিঃস্থ কোণ;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Cause of(কারণ): Industry is the cause of your success.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
Take into account (বিবেচনা করা): Your activities should be taken into account.