pleased,pleasure,pleasant 三者的分别和用法

pleased 形容词/PLEASE的过去分词以及过去式 --形容人
I'M SO PLEASED TO MEET YOU . (高兴的)
pleasure 乐意,名词 IT'S MY PLEASURE TO SEND YOU HOME .
pleasant 快乐的,形容词 It really was an pleasant moment for me .
--形容事物

please是满足的,高兴的;pleasure是名词,表明快乐, it is my pleasure. pleasant愉快是令人愉快的意思