“expect somebody to do something”意思是“某件事物会发生或某人（某事物）会来到”
You can't expect to learn a foreign language in a week.
不要期望一个星期就能学会一门外语。

“expect something from somebody”意思是“期望从某人处得到某事物”
I was expecting a present from her, so I was disappointed I didn't receive one.
我原来一直期望着能收到她送的礼物，所以因得不到而失望。