I can't fully understand what you mean我不能完全明白你的意思,我翻译成I can't fully understand what you mean,can't fully understand 的表达是否正确,我看别人都是这么翻译的：I could not fully understand what you mean 和

I can't fully understand what you mean我不能完全明白你的意思,我翻译成I can't fully understand what you mean,can't fully understand 的表达是否正确,我看别人都是这么翻译的：I could not fully understand what you mean 和
I can't fully understand what you mean
我不能完全明白你的意思,我翻译成I can't fully understand what you mean,can't fully understand 的表达是否正确,我看别人都是这么翻译的：I could not fully understand what you mean 和 I do not fully understand what you mean ,我是自学英语的好多知识都不懂.

I can't fully understand what you mean我不能完全明白你的意思,我翻译成I can't fully understand what you mean,can't fully understand 的表达是否正确,我看别人都是这么翻译的：I could not fully understand what you mean 和
可以这么用.
can表示ability,这么说表示你听不懂对方讲什么,比如你和一个老外对话,你可以这么讲.
如果用do,表示你ability没有问题,但是可能是别的什么原因导致未听清,示意对方再重复一边.
关于could,最好不要这么用,原因如下：
"In conversation.they usually express doubt,with "could" showing the greatest degree of uncertainty or tentativeness." －Longman Spoken & Written English
比如 That could be her.表示”我觉得也会是她“

你说的是对的。
I could not........这里使用了can的过去式，表示我之前不完全明白你的意思。（但是现在明白了）
I can't ......you mean. 和 I don't .......you mean. 意思是一样的。
表示： 我不完全明白你的意思。（指现在）
前一句使用了情态动词 can't, 后一句使用了助动词 don't, 不影响...

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你说的是对的。
I could not........这里使用了can的过去式，表示我之前不完全明白你的意思。（但是现在明白了）
I can't ......you mean. 和 I don't .......you mean. 意思是一样的。
表示： 我不完全明白你的意思。（指现在）
前一句使用了情态动词 can't, 后一句使用了助动词 don't, 不影响句子意思。

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都是可以的，用词不同，语气不同。
can't一般
couldn't比较客气
don't一般
口语里你说
I don't get it. One more time, please.
就可以了。

I can't fully understand it，一定要有it