对英语动词时态语态不懂

题目

对英语动词时态语态不懂
in a few day is time I (shall be enjoying) the sunshine of West Africa instead of shivering here in an English winter.为什么不对
the Curies discobered radium afer they(married) 为什么不是have married
Unless economic conditions improve next year,(there will be)widespread unrest in the United States.为什么不是there is
don not tdll him any thing about me when you( are talking )with him tomorrow.为什么不是will be talking
JOHN spends at least as much time consulting historical documents as he (does writing).为什么不是writes

答案

1、(应该是In a few day's time) shall be enjoying是将来进行时.将来进行时表示将来某时正在进行的动作,常表示事情的正常发展,是由客观情况决定的.所以我觉得这句改为shall enjoy更好.
2、have married是现在完成时.现在完成时不是强调过去,而是强调过去的动作对现在的影响,着眼点是现在.它不能与表示过去时间的时间状语连用.discobered是一般过去时,可见作者强调的过去,所以不能用have married.
3、next year明年,用一般将来时.当主句是一般将来时的时候,条件状语从句要用一般现在时（概括为“主将从现”）,所以从句Unless economic conditions improve next year用了一般现在时.
4、are talking是现在进行时表示将来.这里不用将来进行时.
5、这句不是时态问题,也不是语态问题.这是习惯用法的问题.spend time on doing sth （花时间做某事）中的on可以省略.例子句中consulting 前面就省略了on.后面he does writing是省略句,does指代spends.补全后是as he spends much time on writing.