Question

高中英语问题！！急求速度了，高考英语要用的！学哥学姐速度帮下忙

关于什么是独立主格结构和非谓语动词的区别！区别和用法都说下
如题转换句式，请同事说明详细的理由！还有什么时候用HAVEING BEEN DONE?什么时候又是用HAVE DONE ？一前一后又是什么意思
1because they had warned by the teacher ,they didn't make such mistakes
____________,________________ by the teacher,they didn't make such mistakes
2if it is sunny we 'll go for a picnic tomorrow
_________,we 'll go for a picnic tomorrow
3when she was walking along the street one day ,
_________the street one day

Answer 1

Having been done 是现在分词的完成时的被动语态，用的时候常常会出现一个段时间状语。如：
Having been built for two years, the building will be used as a hospital
done是过去分词，表示被动和完成，如
completed last month, the building will be used as a hospital
having done 是现在分词的完成时的主动形式，用的时候常常会出现一个段时间状语。如
Having worked for a long time , the workers are all very tired.

这些看完了你应该知道题目怎么做了吧

Answer 2

having been done 在句子中做的是状语。。前提是句子中有谓语的情况下。也就是有动词的时候用having been done 表别动，做状语！！

have done 就是谓语动词。。做句子成分。。句子中有东西了就不能用have done了