He's worked there since the shop opened in 1998,hasn't he 为什么是“hasn't he”而不是“isn't he"?

He has worked there (s) last year He’s worked there for all his life.这句话正确吗?worked前面为什么加be? He (s ) as a waiter in that restaurant .He has worked there for two years.填入s开头的单词 since后加现在完成时和一般过去时的区别比如It's three years since he has worked there.和It's three years since he worked there.有什么区别 He's worked there since the shop opened in 1998,hasn't he 为什么是“hasn't he”而不是“isn't he? 这两句英语对不对He's worked there for forty years.And he took good care of others and the others always liked him. -How long has his father worked in that city?-he has worked there s___ last year. He's worked there since 1990,____________?A.doesn't he B.didn't he C.isn't he D.hasn't he选哪个?本题考查反义疑问句 He;s worked in this factory for many years let's help him.he si in t____ SINCE用在现在完成时句子时,现在完成时的动词要用延续行为动词,SINCE后跟过去时句子.这里说的过去时是指一般过去时一种吗?It's three years since he has worked there.和 It's three years since he worked there. 初三英语难题1.Mark (B) in China for 10 years and now he teaches Chinese in BritainAhas worked Bworked Chad worked Dis working为什么选B,帮忙详细解释解释2.Cloud you tell you (B)?A Where's there a good place to eat.B Where there's a go Alee asked the policeman with whom he worked to contact him whenever there was an accident Alec asked the policeman( )he worked to contact him whenever there was an accident he worked there __ over twenty years 用适当的介词填空 He said that his son worked there happy every day.A.saidB.workedC.happy改错 today he still ___ there.(A.works B.work C.worked) 英语看图短文填空,Many years ago Steve worked as an engineer in the Notco Company.He was clever and worked very hard.One day a worker drove a small car so 71 that it hit Steve’s leg.He was quickly taken to a 72 .There a doctor asked Steve to