since he came to china是一段时间吗?前面是用完成时的持续动词吗、？

()joe has worked in this office since he came to shanghai.（划线提问) 划:since he came to shanghai He came to the city two years ago同义句Two years ________ ________since he came to the city.________two years since he came to the city. Mr Green has got u_ to the lifestyle here since he came to China last year 有个小错I HAVE GOT TO KNOW HIM SINCE HE CAME HERE.( )改成( ) Three years_____（pass） since he came to china.中为什么不用被动语态 The doctor has saved a lot of _______(people) lives since he came to our village. Tom came to China.He visited many places.用since改写一句话,保持原意 my brother--------- (learn) some english since he came to this university It was three months since he came to our school改错 It is about 5 years () he came to our school填since or for填哪个? Mike___(visit)several places since he came to Beijing.填什么?为什么? He_eating American food since he came here.Aused toBhave been usedChave been used toDwas used to when the news came __the war broke out he decied to serve.since which that because He_____(live)in Beijing since he came to China.怎么填?是现在完成时还是过去完成时?为什么? Mr Brown （）（design）lots of robots since he came to the company 动词填空 Peter () lots of Chinese food since he came to Garden City.(taste) he has made_ friends here since he came to this factoryA.quite a fewB.only fewC.only a fewD.many He has made great progress since he came to our school.为什么从句用一般过去式,主句用现在完成时?