The verb falloir is used only in the third person singular ( il) form. It generally expresses necessity. Although falloir and devoir often express the same idea, falloir is the stronger of the verbs.
“I have to go to the bank” or “I must go to the bank” can be expressed in any of the following ways:
Falloir is used:
With the infinitive
With the infinitive and an indirect object
With que followed by the subjunctive
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Il faudra que je parte. (I will have to leave.)
To express need
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Il me faudra beaucoup d'argent. (I'll need a lot of money.)