Common errors in English: Usage of Half and A half.

 Half, A half


Incorrect : He came here at seven and a half. 


Correct . He came here at half past Seven.


Incorrect : I took half past two hours to do the work. 


Correct : I took two hours and a half to do the Work.


Note: In telling time, we use the expressions “half past one', 'half past two’ etc. to mean 1.30, 2.30 etc. But when we refer to a duration or length of time, we use ‘one and a half hours' to mean 'one hour and thirty minutes."

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