Ⅰ. be pleased with “对……人/物，感到满意”介词with后接人或物。 如：
① Both Mark and her mother were pleased with the girl. 马克和他妈妈都有喜欢这个女孩。
② I wasn’t very pleased with / at my exam results. 我对自己的考试成绩不太满意。
Ⅱ. be pleased at “对……某事/物，感到满意”。介词at 常与事物搭配使用。
He was very pleased at the news.他对这个消息感到很满意。
Ⅲ. be pleased to “乐意……; 因……而高兴”。to 不是介词，而是小品词。后接动词原形。如：
① I shall be pleased to go. 我将乐意去。
② We are quite pleased to be working in this country. 能在这个国家工作，我们是十分高兴的。