To the letter( অক্ষরে অক্ষরে ) He followed my advice to the letter.
A blessing in disguise( বিপরীতে হিত ; প্রথমে খারাপ হিসেবে মনে হলেও পরবর্তীতে ভালো হয় ) Sam's motorcycle accident was a blessing in disguise because he got enough insurance money.
By far( সর্বাংশে ) He is by far the best boy in the class.
As if( যেন ) He swims so beautifully as if he is the Olympic gold medalist.
At once back and call( বাধ্য ) He is always at my back and call.