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关于动名词的问..Iamverykeenoncycling.Hesattherewithoutsayinganything.Imustapologizefornotlettingyouknowearlier.请问这3个句子里的动名词都是和前面介词组合做介宾短语吗?求解求解啊!!

题目详情
关于动名词的问..
I am very keen on cycling.
He sat there without saying anything.
I must apologize for not letting you know earlier.
请问这3个句子里的动名词都是和前面介词组合做介宾短语吗?
求解求解啊!!
▼优质解答
答案和解析
be keen on doing sth.
apologize for doing sth.
以上两个是短语,需要死记硬背的
wothout doing sth.作状语,介词without后只能接名词、动名词