for over four years是什么时态

for years:
多年以来
好多年

例句与用法:
1. The inheritance kept them afloat for years.
遗产使他们好多年免于经济困难。

2. I've known her for years.
我认识她好几年了。

3. I know a fellow who live for year by his wit.
我认识一个人，好多年来他就靠施展小聪明过日子。

4. The volcano had slumbered for years.
这火山已经很多年不活动了。

5. I've known Tom for years.
我认识汤姆很多年了。

6. Because of a family feud, he hasn't spoken to his wife's parents for years.
由于两家不和，他已经多年不与岳父母说话。

7. I hadn't seen a grasshopper for years since I moved into the city.
从我搬进城里以后，我有好几年没见过蚂蚱了。

8. We have studied English for years.
我们学英语已有好几年了。

for后面加一段时间，用完成时态；现在完成时和过去完成时都可以用for

for over four years是表示一段的时间状语.可以和完成时连用

时态名不知道，描述的是在过去的4年中保持同一个状态

for over four years是什么时态
用完成时态,例如：
He has been learning English for over four years.他学习英语已经四年多了.

for加时间段可用于完成时或是过去时.
用完成时时:表示用那么长的时间来做某事
用过去时时:表示曾经用那么长的时间来做某事,现在已经不做了.