I have been suffering from the cancer for tow years 中的suffer为什么用ing形式

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I have been suffering from the cancer for tow years 中的suffer为什么用ing形式
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I have been suffering from the cancer for tow years 中的suffer为什么用ing形式
I have been suffering from the cancer for tow years 中的suffer
为什么用ing形式

I have been suffering from the cancer for tow years 中的suffer为什么用ing形式
这是现在完成进行时,表示从过去一直持续到现在而且仍在进行中的动作.be动词后面当然加ing形式了.

因为前面用的been 所以要用suffering的形式。
这里是用主动，所以不能用suffered
人遭受到癌症的折磨。suffer是遭受的意思。

这个句子是现在完成进行时，其谓语构成是have/has +been +现在分词

present perfect continuous tense
从以前开始一直到现在仍然suffering 中

I have been selling I have been trying I have ever been I too have been I have been to. I have been I have been in. I have been there,have been 是have been in还是have been to的缩写? i have always been there i have never been there I HAVE NEVER BEEN,能否说I never have been I have been so serious I have been so serious I-have-been-at-home I have always been you I have been loving you I have been a person . I have never been away! I have been wet through because i have been died.