3）Mr Wang has worked in the factory since he came to the city ．
   自从到这个城市以来，王先生一直在这家工厂工作。
4）She's been at this school since five years ago．
   自从五年前以来她就在这个学校。
注意：①在这类句子的肯定句和疑问句中谓语动词必须用延续性动词。短暂性动词由于动作不能持续，故不能与for(达到；累计)或since（自从。。。到现在）引出的时间状语连用。
②对for和since引导的时间状语提问要用How long

1）  他入团两年了。
误：He has joined the League for two years．
正：He has been a League member for two years．
2）我买这辆自行车三年了。
误：I have bought this bike for three years．
正：I have had this bike for three years．

2）  ▲部分短暂性动词与之对应的延续性动词：

 短暂性动词                延续性动词

die            →         be dead

borrow         →         keep

  buy/catch       →         have

get up         →          be  up

  come          →          be  in

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