but for的用法but for its high cost this type of machine sould be very suitable.这里this前面要不要用逗号隔开?是否能用except for 代替?

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but for的用法
but for its high cost this type of machine sould be very suitable.
这里this前面要不要用逗号隔开?
是否能用except for 代替?

but for等同于except for
目前,我国学英语的学生都这样认为：but for总表示“要不是”,与动词虚拟语气连用；except for总是作“除……之外”解,与动词的陈述语气连用.（《英语语法词典》）四川人民出版社,P.144）上也说：“介词短语but for不表示（except for）“除……之外”,而表示“倘若没有；要不是”的意思.其实这是一个误解.but for与except for都具备上述的两个意思和用法.如：
1.But for you everyone has helped.(LEG)除了你之外,大家都帮忙了.
2.But for a half hour or so for lunch I am here all day.(Yeats)除了大约半小时的午饭时间,我整天都在这里.
3.Except for John,they would all have died.（《初高中英语考点难点详解词典》黑龙江人民出版社,赵振才编著,P.284）要不是因为约翰,他们都已经死了.
《英语世界》1990年第一期第376条答问：
Apart from the location,we like everything about the project.（《中高级英语考试指南》顾南华著）
A.Except that B.Except for
C.Aside to D.But for
其《指南》的编者认为答案为D（But for）,而《英语世界》答者和许梦雄教授则认为B和D都正确.英美语言学家也承认这一点.所以,but for 与 except for 无论是意思还是用法,它们是相同的.

要用逗号。不能用except for 代替。
这句话的意思是这类机器要不是价格太高的话就应当十分适合了。例子But for his help, I may have failed the exam.要不是有他帮忙，我可能考试就不及格了。

but for=without，this前需要逗号，可以代替

but...for的虚拟语气用法虚拟语气中but for,if not,but that的意思及用法 but for的所有意思和用法?but for各种意思后应加名词,动词还是句子之类的…… But is it good for us to surf the Internet?用法对么? but i do it for your but for she 还是but for her otherwise或as if以及but for 引导的虚拟语气的用法 For all but But what for是什么意思 but what for? but what for? besides,except,but,except for 等表“除了”介词的详细用法! except和except for用法有什么区别?rt还有 besides but这四者之间的区别单词 beside ,besides ,expect,expect for,but的区别?词性?用法? But for的用法But for friction,people _________ neither walk,nor even stand up.A) can B) were able to C) will be able D) could这里的but for是隐含了虚拟语气吗?那么它相当于if it have had friction吗?再者这个也是一般情况, but to do和but for doing的区别 but,howeveer,yet的一个选择题,请区别3者用法,解释选择的原因_____ I looked for my toy,I could not find it.A.but,B.howeveer,C.yet 这样even though 和but 的用法对吗the most melancholy thing in life is a farewell between those in love ,even though it is but for a short time