1,Mr Black had taught in this school by 1970（改为否定句）

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1,Mr Black had taught in this school by 1970（改为否定句）
Mr Black _ _ _ in this school by 1970
2,By the end of last term, we _ (learn) about three thousand English words.
3,He had cleaned the room by eight o'clock yesterday.( 改为一般疑问句）
3,_ he _ the room by eight o'clock yesterday?
4,John had seen the film before, _ _ (完成反意疑问句）
希望各位英语高手能指点一下过去完成时的一般疑问句,反意疑问句等怎么写?

1 had not taught
2 had learned
3 Had cleaned
4 hadn't he

1,Mr Black had taught in this school by 1970（改为否定句） Now Mr Black taught in another school.This year 按要求改写 Mr Green taught English in our school last term.（改为否定句 He's taught in this school for 15 years already.(否定句） Mr Black no more works in this school.同义句 I have taught in this school for ong year(改为同义句） i have taught in this school since three years ago.改为同义句 i h There are some computers in this school改为否定句 Mr Black has taught English in our school 2001选择:A.for B.in mr black is in the playground now改为一般疑问句和否定句 Mr black goes to work by car every day.（改为同义句）Mr black——his— there were many students in this school last year.(改为否定句） th