一、用already或yet
——Have they taken down the old pictures_yet__?——No,not__yet_.
yet用于疑问句和否定句的,一般放在句末.already用于肯定句
二、用have gone或have been
1.Where the boy students?They_have gone__to the school factory.
2.——Is your father in?——No,he_has gone__to Shenzhen.
——__Has_he ever__been_there before?——Yes,he_has__.
3.I_have__never__been_to Hangzhou before.
have gone,指sb去了某个地方还没回来
have been,是指sb去过某个地方,并且回来了.
希望对您有所帮助~