It`s the first time that he has been to Australia,isn`t it?中,为什么要用isn`t it,而不用hasn`t he?

It's the first time ,for the first time ,the first time ,at first 区别?哪个后面加过去时态 用it's the first time...that造句? it's the first time 后面为什么要接现在完成时, It's the first time that中 that 可省吗 it's the first time that与sb is the first to do 的区别 It’s the first time that he( )the first prize 用wins还是has won It's the first time that he's ever been abroad .的主句是什么 It's like the first It's the first time for me ______(visit)the Great Wall. It's the first time for me to eat the sweet potato p_____ in this way. 英语翻译it's about time baby it's about the time put yourself first baby put yourself first so don't call me selfish it is the first time 用法 英语改错 “It's the first time that he lost a game” it's the first time that后为何加完成时? it's the first time that sb.have done到底是不是强调句 it's the first time that这个句型,后面除了完成时还能其他时态吗? It's the first time that he has been to china.的反意疑问句是什么 it's the first time that i -----to beijing为什么用come,不用have come