1. for the past two years是什么时态？
2. for two hours和two hous差别？

for the past two years是什么时态？

现在完成时

They have enjoyed good harvests for the past several years.

过去好几年他们都获得了好收成.

He has not been near the office for the past three days.

过去三天他一直没有去办公室上班.

For the past two years I have been travelling and living abroad．

例句:For the past two years I have struggled_ to help my two brothers

考查时态。

根据句中时间状语For the past two years在过去的两年，可知用现在完成时。

句意：在过去的两年中，我努力帮助我的两个哥哥

for two hours和two hous差别？

for two hours意思是"有两小时(之久)","for+一段时间"常用来表示一个状态或一个动作延续的时间,常见于一般时态和完成时态，是介词短语。

two hours意思是两个小时，是一个表示时间的短语。