I was in Beijing for a week.这样表达有错么?如题用be in 表状态可否？

I was in Beijing( ) I bought a s___ for my sister when I was in Beijing I was born in a city( )Beijing They _______(study) in Beijing for two years when I was young I was in Beijing for a week.这样表达有错么?如题用be in 表状态可否？ I _____(learn) that song when I was in Beijing. When I [ ] [arrive] in Beijing,it was dark I was in Beijing on the day when he arrived. I have stayed in beijing for a months I stayed in Beijing （for three days） 括号提问 I went to BeiJing by train___ the first time when i was 28a:at b:in c:for d:of Hi,I haven't seen you for a long time.---I__ in Beijing.I've just come back.答案是shall be,was为什么不可以呢 英语翻译I have lived in Beijing for 10 years.I have been living in Beijing for 10 years. I was live in beijing last year=I lived in beijing last year吗?这两种说法都正确吗? My father was in beijing for two years.对for two years部分提问 My father was in beijing for two years.对for two years部分提问 I(w ) in beijing I bought a gift for you in Beijing.(变为一般疑问句（）you()a gift for()in Beijing.