6、eatandorderlystate.●will用于第二人称表请求Willyoupleasesitdown?● 情态动词 dare, need 通常只用于否定或疑问 e . g. , Who dare do it? You needn’t go now .试看下列的填空: We’ll try to finish the work in time, but we need_______ some more workersA. ask for B. to ask for 选项A为不加 to 的不定式,那么此时的 need 为情态
7、动词,此句为肯定句显然不适,答案为B need to do 中的 need 为行为动词dare, need 还可用作行为动词,后面可跟加 to 的不定式试比较, A. who dare do it? B.He dares to do it. A.He needn’t do it B.he needs to do it 上述句子中 A 句为含情态动词的句子,B句中 dare. need 均为行为动词 ◎注意动词 dare 的某些特殊用法。 1 )在下列句子中只可用情态动词 dare