In English when we want to express an obligation, we combine "have" and "to" with an infinitive (first from of the verb).
For example, "I have to be in work at 9AM"
Here you can see the construction "Have" + "to"+ "be"
Remember an obligation is something that comes from "outside" such as a rule or a law we obey.
"You have to drive at 30KM in the city centre"
"Do you have to wear a uniform?"
The past tense of "have to" is "had to" + infinitive.
When we use the past tense we express and obligation that we no longer do.
"When I was a child I had to make my bed in the morning"
The future of "have to" is "will + have + to" + infinitive.
We use the future tense to express a future obligation that we don't have at the moment.
"When I get to the airport tonight I will have to show my passport"
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