Use of Have to / Has to

Using "Have to" in Present, Past, and Future
Learn how "have to" behaves in different contexts.
Certainty ...
1. That has to be Jerry. They said he was tall with bright red hair.
2. That has to have been the right restaurant. There were no other restaurants on the street.

Necessity
1. She has to read four books for this literature class.
2. She had to finish the first book before the midterm.