Would you pls explain the differences and nuances of the use of il faut que +subjunctive and devour + the infinitive. When is it better to use one vs the other?
The verb ALLER is irregular in the Subjonctif Présent:
que j'aille | I go |
que tu ailles | you go |
qu'il/elle/on aille | he/she/we go |
que nous allions | we go |
que vous alliez | you go |
qu'ils/elles aillent | they go |
Note that the nous and vous forms are the same as in L'Imparfait. See Conjugate regular verbs in L'Imparfait (imperfect tense).
As for the other forms, the irregular root aill- is followed by the regular endings of Le Subjonctif Présent:
-e, -es, -e, [-], [-], -ent
Learn more about these related French grammar topics
Examples and resources
Il veut qu'elle aille au cinéma avec lui.
He wants her to go to the cinema with him.
Il aimerait que vous alliez chercher vos sacs.
He would like you to go and get your bags.
Il faut que nous y allions aujourd'hui.
We must go there today.

Il faut que tu ailles voir cette exposition!
You must go and see this exhibition!
Il faut qu'ils aillent aux toilettes avant de monter dans le car.
They must go to the toilets before getting in the coach.
Il veut que j'aille acheter du lait.
He wants me to go to buy some milk.
Q&A Forum 3 questions, 3 answers
There have been discussions about this before. Il faut is more impersonal than devoir; that's the main difference. Devoir conveys a bit more urgency, maybe.
Il faut que vs use of devour + infinitive
Would you pls explain the differences and nuances of the use of il faut que +subjunctive and devour + the infinitive. When is it better to use one vs the other?
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No root? No pattern?

No root? No pattern?
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Subjunctive when?

Subjunctive when?
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