Catalysts : অনুঘটক;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Bear (a) grudge (bear hostility to— শত্রুতা বা বিদ্বেষ পোষন করা—V) We should not bear (a) grudge against our brethren.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.