pleasant和pleased的区别

pleased, pleasant, pleasing, pleasure 的区别和用法
1)pleased指外物作用于感官,使人感到"高兴 、满意、喜欢",常见的结构为:
be pleased+不定式或从句,be pleased with, be pleased at (about)。例如:

I'm very pleased with the performance. We're pleased about (at) your success.
I'm quite pleased that she has got such a good chance.
2)pleasant意为"令人愉快的,舒畅的,非常好的,讨人喜欢的,风趣的"。例如:
They spent a very pleasant afternoon in the hills.
Spring weather is pleasant.
He talked in a pleasant way.
3)pleasing指某物或某人"使他人高兴、招人喜爱"。例如:
These flowers are very pleasing. the girl has pleasing manners.
4)pleasure是名词,指"快乐,愉快的事,乐趣"。例如:
It's a pleasure to meet you.
May I have the pleasure of dancing with you？

附：
It's pleasure 和My pleasure 和With pleasure区别
It's pleasure =My pleasure 用在做某事之后， 比如
----Thanks for helping me！ ----My pleasure /It's pleasure
With pleasure是用在做某事之前
比如----Can you give me a glass of water？ ----With pleasure
It's my pleasure可以用于人家请求帮忙时或者已经帮助别人，别人感谢你时，而且多数用于后者； 而With pleasure只能用于别人请求帮忙时的回答
It's my pleasure.是你已经帮完了别人的忙，别人道谢时你对他说的，表示你很荣幸能帮他这个忙。
With pleasure.是别人请你帮忙，你答应了之后别人谢你，你对他说的，表示你很乐意去做。
It's a pleasure 和My pleasure 用法一样，就是在别人道谢时说不客气。
With pleasure 副词词组“愉快地”的意思。

祝你开心如意！

前者主语是物，后者主语是人。就这么简单~~~
我举个例子吧:
1.I'm pleased to see you.(我很高兴见到你)
2.This is a plwasant thing.(这是件令人高兴的事)

你知道pleased和pleasant应该怎样辨析吗