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In French, to express "one has to/must do [something]", you use "il faut que".
How to use "il faut que" in French
Look at the sentences using il faut que:
The expression Il faut que... is always followed by a verb in Mode subjonctif.
To express obligation, you can also use the structure "Il est nécessaire que + Subjonctif (Il est [adjectif] que + the subjunctive mood (Le Subjonctif) = It is [adjective] for [someone] to ... in French).
See also how to conjugate in Le Subjonctif :
Conjugate regular verbs in the subjunctive present in French (Le Subjonctif Présent)
Conjugate être in the subjunctive present in French (Le Subjonctif Présent)
Conjugate faire in the subjunctive present in French (Le Subjonctif Présent)
Conjugate pouvoir in the subjunctive present in French (Le Subjonctif Présent)
Conjugate prendre and derivatives in the subjunctive present in French (Le Subjonctif Présent)
Conjugate savoir in the subjunctive present in French (Le Subjonctif Présent)
Conjugate avoir in the subjunctive present in French (Le Subjonctif Présent)
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