1. be made of / be made from

. be made of “由……制成/造”成品看得出原料。如：

  The desk is made of wood. 这张桌子是木头制成的。

. be made from “由……制造/成”成品看不出原料。如；

  Paper is made from rags.纸是由破布做的。（已看不出原料）

2. be pleased with/ at/ to

. be pleased with “对……人/物，感到满意”介词with后接人或物。 如：

Both Mark and her mother were pleased with the girl. 马克和他妈妈都有喜欢这个女孩。

I wasn’t very pleased with / at my exam results. 我对自己的考试成绩不太满意。

. 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。

. 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：

I shall be pleased to go. 我将乐意去。

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。

3. be sure of/ be sure to do/ be sure that

.be sure of “确信对……有把握”后接名词、代词或动词-ing 形式，表对客观事物有肯定的认识和判断，主语必须是人。如：

As David joined our team, we are sure of winning the game this time.  

由于David参加了我们的球队，我们这次有把握取胜。

You may be sure of his honesty. 你可以确信他的诚实。