ことは-{が/けれど}
Usage
This structure is used when the speaker admits a proposition is true but wants to qualify the proposition with an additional remark. It is certainly true that - but; indeed -, do V -
Examples
黒澤明の「七人の侍」という映画は面白いことは面白いけど、ちょっと長すぎると思う。
Kurosawa Akira's 7 samurais are indeed a funny movie, funny but a bit too long.
作文を書いたことは書いたけれど、まだ間違いがたくさんあるから書き直さなくてはいけない。
I have written an essay, but I still need to fix all of the errors I have made, so I have to rewrite it.