I can fully understand what you mean, but I can't speak English fluently.

我完全能听懂你的意思，但我的英语讲的不太好。

youdao

I may not fully understand what you mean.

我可能不能完全明白你的意思。

youdao

I may not fully understand what you mean.

我可能不能完全明白你的意思。

youdao