COMMON IDIOMS :

           

               1.     He can lift 100 kg at a time (each time). 

              2.     You can do this at the best (taking the best account) three times.

             3.     He is arguing at cross purposes (misunderstanding each other).

             4.     They are at daggers drawn (in state of violent enmity) with each other.

             5.     I can do it at ease (easily)

             6.     I am at your elbow (close at hand) in all your troubles.

             7.     She was at fault (puzzle) and did not know what to say.

             8.     Mr. Rafiq is quite at home (expert) in Algebra.

             9.     I am quite at home(comfortable) here.

            10. He is at his best (show his powers best) in this type of problem.