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have to

 
See:
have
features:
Grammatical Patterns
part of speech: phrase
definition 1: to have the necessity to do something; be required to; must.
We have to finish the project by Friday.You don't have to stay here; you can go home now.
definition 2: used to make a confident judgment about something based only on logic rather than knowledge of the facts; must (used in affirmative statements only).
This HAS to be the right house--look at all the cars in front!There HAS to be a gas station somewhere around here![there + verb + to be/infinitive ]