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had better [误] You have better hurry. [正] You had better hurry. [析] had better只用过去时had，不要误用成现在时have。 [误] You hadnt better worry. [正] You had better not worry. [析] had better后面加不带to的不定式，其否定式是had better not+动词原形。 half [误] I had driven about half mile. [正] I had driven about half a mile. [析] 半小时有两种讲法half an hour, a half hour. 而一个半小时应讲an hour and a half或one and a half hours.半天应讲half a day，半镑应讲half a pound.但要尽量避免使用half a year，而应用six months;不用half a month, 而用two weeks或fifteen days. [误] Half us could go to the park. [正] Half of us could go to the park. [析] half用于名词前可用of结构也可不用of结构，但用于代词前则必须加of。如：More than half (of) my classmates are boys. [误] One and half apples are left on the table. [正] One and half apples is left on the table. [析] 一个半one and half后面的名词要用复数，而句中的谓语动词却要用单数。 [误] Half of the work are done. | 
