这几句过去时对不对?急

1.语法没错但是没人会这么说
who kept coughing?
2.what was liming doing at 8 o'clock?
因为有具体时间所以要用过去进行时
3.you are going to report your findings in 5 minutes
will是表示主观意志的,而题目是祈使别人的