中途半端な文法パート９

１．　が最後　・　たら最後： Once you ... that's it; If ... that will be the end of it.
例文：　勉強せずに試験を受けたら最後、絶対に失敗する。　
Notes: Conveys a feeling that is someone does some particular action, everything will be lose/over. This pattern is also used to convey a sense that once you start something, that situation will continue. たら最後 is the more colloquial version.

２．　なくして（は）： Without ...; if it were not for ...
例文：　努力なくしては成功なんかあり得ない。　
Notes: Carries nuance of "without X, it would be difficult to Y. Pattern follows a noun, which are desirable things. Sometimes seen in the idiom　愛をなくして何の人生だろう。

３．　とあれば： If for ...
例文：　子供の教育費とあれば、多少の出費も仕方がない。　
Notes: Pattern is used when something is necessary or acceptable because X is for something. Often used in idiom ためとあれば. Requests or invitations do not follow pattern.