before和once引导的时间状语从句
摘要: before和once引导的时间状语从句before“在…之前；还没（来得及）...就;趁着还没...”Wehadsailedfourdaysandfournightsbeforewe......
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before和once引导的时间状语从句 before “在…之前；还没（来得及）...就; 趁着还没...” We had sailed four days and four nights before we saw land. 在看见前陆地，我们航行了四天四夜。 【固定用法】 ① it was（not）/had done＋一段时间＋before（vted）…“还要过多久才…（不多久就…了）” ② it will（not）be＋一段时间＋before（一般式）… “还要过多久才…（不多久就…了）” ③ there is +一段时间+to go（=left）＋before（一般式）... “在...之前” ④ long before “不久前”, 用于一般过去时和完成时中；before long = soon/not long after “不久后”,用于一般将来时和一般过去时中。 It was three weeks before he came back. 过了三个星期他才回来。 I had learned driving long before I bought a car. 我买汽车之前早就学会开车了。 高三英语单词 初中人教版英语课本 人教版高中英语电子课本 once（一旦/曾经,常放在句首）/as soon as/the moment /the minute/the instant/immediately/ directly/instantly, /hardly（scarcely,rarely）…when/no sooner…than （一…就…）; hardly/ scarcely/ rarely/ no sooner置于句首须半倒装，构成hardly[scarcely,rarely]/no sooner+had +s+done...when/than）. As soon as she saw the monster, he turned pale. 她一看见怪物就脸色苍白。 the first（second…）time/last（next）time/every（each）time/by the time（常与完成时连用） The first time I drove the car, I felt very nervous. 我第一次开车时，我感到非常紧张。 1．If a lot of people say a film is not good, I won't bother to see it, or I'll wait ________ it comes out on DVD. 2．It was a nice meal, ________ a little expensive. 3．Try ________ she might, Sue couldn't get the door open. 4．He had no sooner finished his speech ________ the students started cheering. 5．If you happen to get lost in the wild, you'd better stay ________ you are and wait for help. 6．—Coach, can I continue with the training? —Sorry, you can't ________ you haven't recovered from the knee injury. 7．All the photographs in this book, ________ stated otherwise, date from the 1950s. 8．Hot ________ the night air was, we slept deeply because we were so tired after the long journey. 9．A number of high buildings have arisen ________ there was nothing a year ago but ruins. 10．He smiled politely ________ Mary apologized for her drunken friends. 11．She says that she'll have to close the shop ________ business improves. 12．It's much easier to make friends ________ you have similar interests. 13．You must learn to consult your feelings and your reason ________ you reach any decision. 14．Mark needs to learn Chinese ________ his company is opening a branch in Beijing. 
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