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在英语中,连词 + done 是什么 意思 举几个 例子..顺便说下怎么用 ..

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在英语中,连词 + done 是什么 意思 举几个 例子..顺便说下怎么用 ..
当过去分词或过去分词短语用作状语时,有时根据语义的需要可以在其前加上相应的连词,如when,while,as,after,before,till,until,if,unless,although,though,even if,even though,once等.如:
If accepted for this post,you will be informed next week.(=If you are accepted for this post,you will be informed next week.) 如果你被接受担任这个职位,将在下周通知你.
When heated,ice will be changed into water.(= When it is heated,ice will be changed into water.冰加热时,就会变成水.
Once seen,it can never be forgotten.(= Once it is seen,it can never be forgotten.这东西一旦看到一次,就永远也忘不了.
Unless (it is) changed,this law will make life difficult for farmers.除非加以修改,否则这条法律将给农民的生活造成困难.
Although built before the war,the engine is still in perfect order.(=Although it was built before the war,the engine is still in perfect order.) 尽管是战前制造的,这台发动机仍然处于良好状态.
Once exposed to light,the film will be damaged and get useless.(= Once exposed to light,the film will be damaged and get useless.) 一旦曝光,胶卷就要被损坏而不能用了.