前者是渴望做某事；如：I'm eager to get full marks in the exams.我希望在考试中得到满分,不现实)
后者是愿意,乐意做某事,如：I’m willing to help you !我很乐意帮助你!

be eager to do something是渴望做什么，一般后接动词，be eager for something 渴望什么东西，一般后接名词。

be eager to

英 [bi: ˈi:ə tu:]   美 [bi ˈiɚ tu]  

盼望，渴望

拓展资料

1、It does no look good for you to be eager to leave. 

急于要走是不好的。

2、"Whatever you need, she will be eager to help you." 

“不论你要什么，她将盼望能帮助你。”

3、Recently it seemed I have come to a standstill. I knew people should not be eager to seek for something, and should not linger around either. 

最近，我好像停滞了脚步，虽然人不一定要急于趋向什么，但也不应徘徊退缩。

4、And it may be eager to fight other dogs. 

有时候会因此而和其他狗起冲突。

be eager for

英 [bi: ˈi:ə fɔ:]   美 [bi ˈiɚ fɔrwww.souquanme.com]  

v.渴望;渴求

拓展资料

1、The two gangster seem to be eager for the fray. 

那两个歹徒似乎唯恐不乱。

2、It shall be eager for you, and you will be mastered by it. Since thINgwTee program controls the computer, the computer waits, too. 

它在等待时机找你，你会被它控制的。由于程序控制主机，所以主机也必须等待。

3、From striving for the survival right to be eager for more right to enjoyment and development, the working classes have been fighting to the bourgeois all the time while they were born. 

从争取基本的生存权到争取更多的享受和发展权，工人阶级自产生之日起便不断同资产阶级进行一系列的斗争，逐步实现自身的休闲权。

4、Be eager for your help; 

渴望得到你的帮助；

eager ['i:ə]
adj. 渴望的；热切的；热心的
网络释义
Eager:渴望|渴望的，热切的|热心于
Johnny Eager:双雄喋血|热血强人
eag//www.souquanme.comer for:渴望|渴望,|迫切要
例句
Investors are eager to invest in us.
投资者渴望在我们这里投资。
The boys listened to my story with eager.
男孩们以热切的心情倾听我的故事。
How eager Mike is to s//www.souquanme.comtay with his father!
迈克是多么渴望与爸爸呆在一起啊！
Moreover, people are eager to help you along your way.
此外，在一路前行的过程，人们会热心的帮助你的。
The children't eager faces made him stop to give them candy.
孩子们渴望的脸孔让他停下脚步给他们一些糖果。
In difficult times, people are eager to help strangers in need.
在艰难时期，人们都乐于帮助有困难的陌生人。
As a Cuban, my father was eager to adapt to his new environment.
他说：“父亲虽是古巴人，他急于适应新环境，也不说西班牙语。”
All the children listened to his adventures with eager attention.
孩子们聚精会神地听他讲他的冒险经www.souquanme.com历。