Il faut que tu viennes.
English: You must come.
The 'subjonctif présent' is a French verb mood used to express wishes, doubts, emotions, necessity, or uncertainty. It is different from the indicative, which states facts.
Use the subjonctif présent after certain expressions (like 'il faut que', 'je veux que', 'bien que'), when expressing wishes, emotions, doubts, possibilities, or necessity.
Il faut que tu viennes.
English: You must come.
Je veux que tu sois heureux.
English: I want you to be happy.
Bien qu’il fasse froid, il sort.
English: Although it is cold, he goes out.
Je doute qu’elle comprenne.
English: I doubt that she understands.