what the grammar ことぐらい mean


I bump up in in sentence on manga

[code]

    僕とじゃ釣り合わないことぐらい
    
[/code]

I guess the translation is that I am not fit for




> 僕とじゃ釣り合わない **ことぐらい**

The sentence is cut off. It would depend on the context, but the unsaid,
implied half of it should probably be something like わかってる。 or 知ってる。

The こと is a nominalizer. It functions like "that..." in English, as in:

> 「[sentence]+ **こと** を知っている。/ **こと** がわかっている。」  
>  = "I know **that** +[sentence]."

くらい/ぐらい is a belittling suffix. (The particle くらい/ぐらい replaces the case
particle を/が.) It can express [how minimal, trivial, slight, weak, easy, etc.
something is](https://japanese.stackexchange.com/a/34132/9831). For more on
the usage of くらい/ぐらい and examples please refer to:

  * [Understanding くらい](https://japanese.stackexchange.com/q/34126/9831)
  * [The difference between くらい and ほど in hyperbole](https://japanese.stackexchange.com/q/2392/9831)
  * [Meaning of ぐらいじゃ足りない](https://japanese.stackexchange.com/q/33995/9831)

So your sentence means something like:

> 僕とじゃ釣り合わないことぐらい（わかってる。/知ってる。）  
>  "I know very well that I'm not enough for (you/her/someone)."  
>  "I'm well/fully aware that I'm not good enough for (you/her/someone)."

with a nuance that the fact is so obvious, easy to know, etc.




> 僕とじゃ釣り合わない **ことぐらい**

The sentence is cut off. It would depend on the context, but the unsaid,
implied half of it should probably be something like わかってる。 or 知ってる。

The こと is a nominalizer. It functions like "that..." in English, as in:

> 「[sentence]+ **こと** を知っている。/ **こと** がわかっている。」  
>  = "I know **that** +[sentence]."

くらい/ぐらい is a belittling suffix. (The particle くらい/ぐらい replaces the case
particle を/が.) It can express [how minimal, trivial, slight, weak, easy, etc.
something is](https://japanese.stackexchange.com/a/34132/9831). For more on
the usage of くらい/ぐらい and examples please refer to:

  * [Understanding くらい](https://japanese.stackexchange.com/q/34126/9831)
  * [The difference between くらい and ほど in hyperbole](https://japanese.stackexchange.com/q/2392/9831)
  * [Meaning of ぐらいじゃ足りない](https://japanese.stackexchange.com/q/33995/9831)

So your sentence means something like:

> 僕とじゃ釣り合わないことぐらい（わかってる。/知ってる。）  
>  "I know very well that I'm not enough for (you/her/someone)."  
>  "I'm well/fully aware that I'm not good enough for (you/her/someone)."

with a nuance that the fact is so obvious, easy to know, etc.

