麻烦帮看下这句话对吗?The teacher says we have to study hard

The teacher tells us that we have to study hard to get a more secure future!
这是一个宾语从句,that可以省略,对句子本身的结构不会有影响.
The teacher 讲述的是一个事实,应该用tell
以下是tell跟say的区别
say指用语言表达自己的思想,着重所说的内容,它的宾语只能是"话",不是"人"
如：How do you say this in English
tell是告诉某人一件事.用于tell sb.sth.这个句式,可以带两个宾语,一个指人,一个指物
如：Please tell us something about your schoo