Have to /say that/ must be used when the need to do something now or in the future.
-example-
John, you have to come out of the water now!
"You have to go home now.".
You just need to go home now.
You need to see the doctor
You have to learn English.
You need to learn English
We have to do ironing tomorrow.
He does not have to clean the kitchen.
The subject is I, You, We, They range from 2 up or whatever to do not have to.
subject as He, She, It has one use, or whatever does not have to./