英文文法 (4)

Both are correct.

There are some differences.

"Half of " is more formal.
As the subject of a sentence, use "Half of". (not a rule though.)
"Half of" presents the numbers as a fact.

"Half the" be emphatic on the numbers, whether too many or too few.
e.g.
The ambush killed half the platoon.
The takeover will see half the staff lay off.
We completed the project with half the budget.

Use "Half the" when comparing to another thing of similar nature.
e.g.
If they can finish the work in a month, we can do it in half the time.



2012-01-10 05:33:49 補充：
TOMING88 又胡亂答題。

half the staff=corresponding parts into which no. of staff is divided.eg.Thirty and a third are the proportion greater than half the staff (adv).
half of the staff= Two halves make a whole. (no.of staff)x 2 =maths total, eg.Half of the staff (adv) makes 1/2 .

half可做名詞,形容詞,副詞,但唔可以做動詞
就咁睇half the staff係錯.
half(名詞)of the staff
half解釋+例句:http://www.iciba.com/half/1ba816fd99069fbd3fcd1f05feaa2c4b/

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half the staff
半數職員
half of the staff
職員人數之一半