英语语法问题he knows french,not to mention english,其中有一个插入语not to

英语语法问题
he knows french,not to mention english,其中有一个插入语not to mention.其中not是副词,to mention是不定式,后面加了一个名词english,怎么感觉这里not to mention类似于介词的用法啊?

He knows French,not to mention English,
动词不定式用法
句子意思：我懂法语,更不要说是英文了
1.更不用说
Old folk and children alike are all against the proposal,not to mention the youth.
老人、小孩都不赞成这个建议,更不用说年轻人了.
Ade is handsome and smart,not to mention being a good athlete.
艾德不但是个好运动员,而且既潇洒又精明.
1.It was advisable for you not to mention that.你不提及那件事是明智的.
2.Ade is handsome and smart,not to mention being a good athlete.
艾德不但是个好运动员,而且既潇洒又精明.
3.I had enough presence of mind not to mention my intention.
我镇定自若,没有说起我的意图.
4.The dampness is uncomfortable,not to mention the cold.
潮湿就令人不舒服,更不必说寒冷了.
5.Haas decided not to mention his cold.
哈斯决定不提他患了感冒.
6.You must promise not to mention.
你必须答应不提此事.
7.Old folk and children alike are all against the proposal,not to mention the youth.
老人、小孩都不赞成这个建议,更不用说年轻人了.
8.Lots of periodicals in foreign languages have been subscribed to,not to mention those in Chinese.且不说中文期刊,外文期刊也订了不少.
9.He did not want to mention the painful past.
他不愿意提起过去的伤心事.
10.Not to mention the physical effects of neural or endocrine overload.
更不用说神经和内分沁超负荷对身体的影响了.
11.Not to mention that all Englishmen are born heretics.
且不说英国人都是天生的异端分子.
12.They have three dogs to look after,not to mention the cat and the bird.
他们有三只狗要照顾,更别提那只猫和鸟了.
13.We can't afford a car,not to mention the fact that we have no garage.
我们买不起汽车,没有车库的事就更不必说了.
14.He has a big house and an expensive car,not to mention a villa in France.
他有一所大房子和一辆昂贵汽车,且不说在法国还有一座别墅了.
15.He teaches me to obey all command and not to mention any problem.
他教我听从一切命令而不提任何问题.
16.The boy haven't absorbt arithmetic,not to mention algebra.
这宝宝算术还没搞会,更谈不上代数了.
17.Not to mention it has a better effect than raptor strike.
更不用说它可以给猛禽打击提高效率.
18.Years were wasted,not to mention lives and money.
这么多年都白费了,更不用提人命和金钱了.
19.Not to mention that there are more pressing moral obligations.
然而却没有提到应该承担更多的道德义务.
20.That idea was pretty nutty.Not to mention stupid.
这主意太过疯狂,更不用说有多么愚蠢了.
再问： 那not to mention french这句话在句子里面做什么成分呢
再答： 那not to mention french这句话在句子里面做什么成分呢 not to mention French , 是动词不定式在句子充当插入语，用作评注性状语 还有下面一些 动词不定式 如：t to be frank（坦率地说），totell you the truth（说实话），so to speak （可以说）等。 to be sure （无疑地）， to sum up （概括地说）， to be honest， to be short， to conclude， to put it briefly， to put it in another way， to begin （ start ） with 等。 To be frank, I don’t quite agree with you. 坦率地说，我不太同意你的意见。 That’s a wonderful idea, to be sure. 这个主意好极了，的确。 To tell you the truth, I am not veryinterested in going to the show. 说实在的，我不太想去看演出。