unless = if not =except if
unless本身就有否定意味，其實就相當於if條件句的否定形式(if not)，中文要表達「除非…否則…」、「如果不…」，英文只要用unless就可以，後面一定為肯定句，否則會造成雙重否定的問題。
連接兩句時：句子1 + unless + 句子2，意味著若「句子2」不成立時，就會發生「句子1」這種狀況。
除非；除了在…的情況下
You can't get a job unless you have experience (= you can only get a job if you have experience).
除非有工作經驗，否則你找不到工作。
Unless you call me to say you're not coming, I'll see you at the theatre (= I will see you there if you do not call to say you are not coming).
除非你打電話說你不來了，否則我就在劇院等你。
Will it be all right if I don’t wear a tie?
He’ll fail his exam if he doesn’t study. (他將會考不好，除非他讀書)
He’ll fail his exam unless he study. (除非他讀書否則他會考試失敗)
other than/besides/except/except for/aside from/apart from文法使用方式
雙重否定句 not,never,no without/butVR
assist/consist/resist/persist/insist/Persevere 用法
lest/for fear of /for fear that /in case of /in case/ in the case of 文法
There is no denying that or what how when 名詞子句
lest/for fear of /for fear that /in case of /in case/ in the case of 文法
assist/consist/resist/persist/insist/Persevere 用法
偷東西thief robber burglar looter shoplifter mugger steal pickpocket 的差別
not to mention/not much of a 使用方法
nothing but/ anything but/ everything but 用法
As soon as /Once/ On+ v-ing/ Hardly when 一~就~文法
表雖然although /Much as/ Despite /In spite of 句型
rise arise raise arouse 使用方式 notes
It is/was 被強調部分+ that 子句 強調句文法
英文worth worthy worthwhile用法 notes
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