How would you use Bi as a question to compare something in Mandarin?
I’m smarter than him.
我比他聪明。
Am I smarter than him?
我比他聪明吗?
明天比今天冷吗?
Will tomorrow be colder than today?
yeah, pretty much this.
Compare 1 + 比 + Compare 2 + Adj + 吗?
(eg, boromir above)
or
Compare 1 + 比 + Compare 2 + Adj + questioning measure
(eg, lesson, 你哥哥比你大几岁)
If you want Chinese grammar then Chinese Grammar Wiki is best eg → Basic comparisons with "bi" - Chinese Grammar Wiki
My own experience, was to largely not spend a lot of time on Chinese grammar and just let it “seep” in, so to speak. But stumbling around, over and under a grammar explanation does sometimes help things “click” in.
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Thank you, both of you really helped