Incompetent : অযোগ্য ; অক্ষম
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Appropriate Prepositions
Consist of(গঠিত হওয়া): The committee consists of ten members.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
Inferior to (নীচু/হীন): He is inferior to his neighbor.
Look at (তাকানো): Students look at the blackboard.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Slow coach (অলস): You cannot expect much from a slow coach.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.