是there be sth to be done还是there be sth being done?there be sth in doing和there be sth being done有什么区别?谢there are many advantages to purchasing things online.怎么成了to doing了？
问题描述：
是there be sth to be done还是there be sth being done?
there be sth in doing和there be sth being done有什么区别?谢
there are many advantages to purchasing things online.怎么成了to doing了？
答
这里to是介词 当to为介词时后跟动词的ing形式
答
to be done是将要被做的意思,而being done是正在被做的意思,时间不一样.
to 有两种意思,一种是动词不定式,一种是介词,后面加动词的ing形式.
而你补充的是to作介词的用法.