you must let you mother know first和you need let you mother know first 第二句错误,为什么
推荐回答(3个)
must 用做情态动词 是必须的意思 语气比较强烈
need 既可以做情态动词 又可做实义动词 可做情态动词只用于疑问句和否定句
不用加to 就如上位姐姐说的那句 要加to
可我觉的情态动词 重在说话的语气 而must明显比need语气强烈
所以我的应是这样
need 后面 要加to
他确实也有 情态动词的用法 但是当情态动词的时候 一般都用 否定的 表示不必 needn't
做 实意动词的时候 后面要用不定式
祝你学习进步
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