求英语大神帮我讲解 don't need 和needn't 的区别即用法 要加to嘛?
3个回答
一个作为动词need,若变否定句则要借助助动词do,所以为don't need;
另一个作为情态动词need,同can的用法,若变否定句则直接加not,所以为needn't
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