二、副词的比较级和最高级

1.只有少数单音节的副词是以加-er和-est来构成比较级和最高级的，如：hard, harder, hardest; slow, slower, slowest; fast, faster, fastest; early, earlier, earliest.

2.大多数都是以加more贺most的方法来构成，如：

often, more often, most often;

carefully, more carefully, most carefully;

successfully, more successfully, most successfully.

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