please 动词 Please have your sit !
pleased 形容词/PLEASE的过去分词以及过去式
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 .
(可以跟PLEASED 替换,意思都一样)