What does 幾分 means in 我愛你有幾分?
我 = I


愛你 = love you


有幾分? (in what degree) = how deep? --&gt; how much?


我愛你有幾分? = how deep I love you

分(degree) here is a classifier for depth
Example:
沒半分愛意 (don't have a tiny bit of love) 半分 --&gt; very little/ very lightly
有幾分愛意 (have some degree of love) 幾分 --&gt; mildly
十分愛你 (love you very much); 十分 --&gt; fully