"I was waiting for so long"这句话有什么语法错误?这是一句歌词

"I was waiting for so long"这句话有什么语法错误?这是一句歌词
"I was waiting for so long"这句话有什么语法错误?
这是一句歌词

"I was waiting for so long"这句话有什么语法错误?这是一句歌词
这个句子少了宾语,说起来不通顺.
这里有很多种修改的方式.(不改变原句的大概意思.）
1.l was waiting for you so long.把you加上,翻译为：我已等你很久了.
2.l was waiting for a long time.在这里,long time就是宾语了,我已经等了很久.
3.l was waiting for you for a long time ago.翻译为：我已经等你等得很久了.ago加上表示过去式.
4.l have waited for you so long.不改变意思,换一种方法来形容过去的waiting.

so long 不是很久的意思
可以说
i was really waiting for a long long long time.

was waiting的话，不应该接for so long，
因为，他是过去进行式。
应该是：I have been waiting for such a long time/
.

I have been waiting for so long.
for so long 应该用在完成时的句子中．

不应该有for