A. I don’t know as many people as you do. (= you know more people)
A1. It’s not warm, but it isn’t so cold as yesterday (= it isn’t as cold as)
A2. I spent less money than you (= I didn’t spend as much money as you)

B. use as ~ as (but not so ~ as) in positive sentences and in questions.
B1. Also twice as ~ as, three times as ~ as etc. (e.g. Our house is about three times as big as yours)

C. use the same as (not the same like. (e.g. David is the same age as James)

D. Than me/ than I am (e.g. He’s not as clever as she is. = He’s not as clever as her (not she)