NOT ONLY....BUT ALSO

NOT ONLY....BUT ALSO is probably the most commonly used idiom in the GMAT.

Consider this sentence please-

NOT ONLY is ROY tired BUT he is hungry.

Now, the above sentence is a wrong idiomatic expression.

The correct usage is:

NOT ONLY is ROY tired BUT he is ALSO hungry.

NOTE: Its not always essential to place BUT and ALSO together, they can be in a split as shown in the above sentence.