check in 是酒店入住登记，check for 是查什么，check with 是与某人核对，例如：
1.It is vital to keep a check on your speed.经常检查并控制你的车速是至关重要的。
2.We always check people's addresses as a matter of course.我们总是照例检查一下人们的地址。
3.Check the oil and water before setting off.出发前应查看一下油和水。
