1.when did she get married?为什么不能这样表达:when did

1.when did she get married?为什么不能这样表达:when did
she marry?get married?和 marry都是表示短暂性的动词呀?
2.who is your best friend?do you think?合并成一句:do you think who your best friend is?who do you think is your best friend?who do you think your best friend is 这三种表达都对吗?书上说 do you think 后接宾语从句,如接是特殊疑问词,则疑问词做连接词,可以放在句首,也可以放在句中.放在句首和放在句中后面的语序一样吗?
3.i will (leave very early tomorrow morning for the office,) because i have lot of work to do.请问括号内的顺序能变成这样吗:leave for the office very early tomorrow morning .如果不行,那说说为什么?
4.for as long as i can remember i have always enjoyed reading.此处for 什么语法
5.do you know which city is the biggest one in the USA?请问do you know 和do you think后接带有特殊疑问词的宾语从句时,用法一样吗?特殊疑问词也可以放在句首或句尾吗?