[析] 半小时为half an hour, 半天为half a day, 半镑为half a pound, 尽量避免用half a year, half a month, 要用six months, two weeks 或 fifteen days 要注意的是Half of the work is done? Half of the books are sold. 当Half 作名词时，其谓语动词要看of后面的名词而定。如名词是不可数名词则用单数谓语动词，如是复数名词时，则要用复数谓语动词。要注意的是一个半的表达法， 如：One and a half apples is left on the table.其名词要用复数，但谓语动词则要用单数。
[误] 60 students are playing on the ground.
[正] Sixty students are playing on the ground.
[析] 在句首的数字要用文字而不要用阿拉伯数字，如数字过大则应放于句中，用阿拉伯数字。如： There are 166 students playing on the ground.
[误] He became famous around fifty years old.
[正] He became famous in his fifties.
[析] in his fifties 50多岁时，而in the fiflies 在50年代。
[误] There are about two thousands workers in our factory.
[正] There are about two thousand workers in our factory.
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