Conjugation of the verb falloir
Active 
Indicative 
Present
il faut
Imperfect
il fallait
Simple past
il fallut
Future
il faudra
Present perfect
il a fallu
Pluperfect
il avait fallu
Past anterior
il eut fallu
Future perfect
il aura fallu
Subjunctive 
Present
qu'il faille
Imperfect
qu'il fallût
Past
qu'il ait fallu
Pluperfect
qu'il eût fallu
Conditional 
Present
il faudrait
Past 1
il aurait fallu
Past 2
il eût fallu
Imperative 
Present
Past
Participle 
Present
Past
fallu
ayant fallu
Infinitive 
Present
falloir
Past
avoir fallu