that companies need not warn customers of obvious dangers or bombard them witha lengthy list of possible ones1 need not warn customers 后面的of obvious dangers 这个介词短语作的是句子的什么成分2need not warn 不需要做need 在这
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that companies need not warn customers of obvious dangers or bombard them witha lengthy list of possible ones1 need not warn customers 后面的of obvious dangers 这个介词短语作的是句子的什么成分2need not warn 不需要做need 在这
that companies need not warn customers of obvious dangers or bombard them witha lengthy list of possible ones
1 need not warn customers 后面的of obvious dangers 这个介词短语作的是句子的什么成分
2need not warn 不需要做
need 在这里是实义动词还是情态动词
need do sth need to do sth need doing sth
以上三个词组有什么区别
that companies need not warn customers of obvious dangers or bombard them witha lengthy list of possible ones1 need not warn customers 后面的of obvious dangers 这个介词短语作的是句子的什么成分2need not warn 不需要做need 在这
1.of obvious dangers 做动词短语 warn customers 的状语;
of 表示的意义是:关于...的;在...方面的;
又如:accuse sb.of sth; rob sb.of sth 介词短语 of...的作用类同;
2.need 在本句中是情态动词;
3.need do sth need to do sth need doing sth 表达的语义基本一样,都是"需要做某事",
但语法上是有区别的:
need do sth 情态动词 need + 实意动词 do + 宾语
need to do sth 实意动词 need + 动词不定式 to do sth
need doing sth 实意动词 need + 动名词短语 doing sth