I'll say! 是啊！的确如此！
A: Wow, this bookshop has everything.
B: I'll say! I didn't even know copies of this book still existed!
Having said that
It’s expensive. Having said that, I must admit that it is very well made.
I wouldn't say no. 好的
A: Do you want to try that new sushi place for lunch?
B: I wouldn't say no!
Not to say 虽不能说是
It is unwise, not to say stupid, to quit your first job after only one month.
Do you know what I'm saying?
We're in serious trouble. Do you know what I'm saying?