it is a waste of time doing还是to do为什么
是
It is a waste of time to do something.
因为这是动词不定式的复合结构。
It&垆杪屑丝#39;s adj. for sb to do sth for sb to do sth是真正的主语,sb是to do sth的逻辑主语的。
如: It is impossible for him to get up early. It's important (for me) to carry on practicing speaking for learning English.
动词不定式的复合结构是“for / of sb. to do sth.”。
扩展资料
不定式复合结构的介词用for还是of,主要决定于前面形容词的性质。
一般说来,of前面的形容词是careful, clever, foolish, good, kind, nice, wise等,说明人的特性。
for前面的形容词是dangerous, difficult, easy, hard, heavy, important, interesting, necessary等,一般说明不定式动作的特性.
前面如果是名词用for。如:
1.It’s a good idea for parents to allow children to study in groups during the evening.
对父母来说,在晚上让孩子分组学习是个好主意。
2.It’s wise of him to do it well.
对他来说,把这件事做好很明智。
声明:本网站引用、摘录或转载内容仅供网站访问者交流或参考,不代表本站立场,如存在版权或非法内容,请联系站长删除,联系邮箱:site.kefu@qq.com。
阅读量:52
阅读量:44
阅读量:70
阅读量:69
阅读量:62