Beijing,I,had,before,lived,in,ten,came,years,I,here,for连词成句 急

Beijing,I,had,before,lived,in,ten,came,years,I,here,for连词成句 急 I have been to Beijing before.______A So do i B SO had i C SO have i D SO did I after,before,sinceI saw Bill yesterday,we had not seen each other ( ) i left beijing.这三个单词的用法能详细说明吗? i have been to beijing before.(否定句） _______________________________________. I haven't ()to Beijing before（travel） i like beijing,the place which i had lived in .是否等于:i like beijing where i had lived in. I had ever seen it before.和[I had never seen it before.]有什么区别? I had a great time in Beijing改为一般疑问句 I had a great time wite you in Beijing. Perfect! I had avery good time in Beijing.谢谢! I had fun in Beijing last week变否定句 I have gone to Beijing before.have,gone,to,before这些单词中,哪个不对? I had had lunch before they invited before they invited me for meal. It was different from the music classes I had had before.为什么需要两个had i have been learned English before. i had been learned English before. 有什么分别? I had known her long before. 为什么要用过去完成时? 翻译three years had pasted before I knew it Beijing was such a terrible sandstorm( )few citizens had ever experienced before为何选that不用as