I called at the Smith's yesterday.
我昨天去了史密斯家。
I called on the doctor yesterday.
我昨天去拜访了医生。
I called at the doctor's yesterday.
我昨天去了医务室。
另外，call on还可以"号召"，后面往往接动词不定式作宾语补主语。如：
The headmaster called on the students to work harder.校长号召学生们更努力地学习。
call for
1. 要求：
He sat down and called for some beer.
他坐下来要了一些啤酒。
The crew of the ship are calling for a raise in pay.
这艘轮船上的全体船员正在要求增加工资。
2. 需要；必需：
To be a nurse calls for endurance and patience.
作一名护士需要有毅力和耐心。
This good news calls for a celebration.
这个好消息值得庆祝一番。
3. 去取；来取；去接；来接：
I'll call for you at seven.
七点我来接你。
Shall we send these books, or will you call for them?
这些书是我们给您送去，还是您来取呢?
4. 预期；预示：
The weather forecast calls for snow flurries tonight.
天气预报预示今夜有小雪。
5. 规定：
The traffic regulations call for that all vehicles should keep to the right.
交通规则规定车辆一律靠右行驶。
6. 大声叫喊要…：
The bricklayer on the roof was calling for more tiles.
房顶上的.瓦工招呼再送些瓦上去。call in叫(某人)进来; 来访
Call in this evening if possible.
可能的话今晚来一趟。
找〔请〕来
How many friends will you call in?
你将邀请多少位朋友?
