say this/that much for sb/sth

to say something good about someone or something considered to be bad

为…说好话，为…美言

I'll say this much for Kay, she always agrees to help whenever we ask her.

我要为凯美言几句，只要我们提出来，她总是愿意帮助我们。

I'll say this much for him—he never leaves a piece of work unfinished.

我要为他说句公道话—他从不半途而废。