Conjugation after the use of que

Question

Je veux tellement qu'ils finissent ensemble. Je le souhaite de tout mon cœur.I want them to end up together so much. I wish it with all my heart.
why is it qu'ils finissent and not qu'ils finir ensemble. Isn't the second verb supposed to be infinitive or does the que indicate the beginning of a new sentence?

Accepted Answer

Bonjour Nengi,
After a structure such as "vouloir que", the following verb will be conjugated (i.e. "finissent") and not in its infinitive form (i.e. finir). 
Je veux que tu manges ta soupe  = I want you to eat your soup
-> vouloir que + [Subjonctif]
Je veux manger ta soupe = I want to eat your soup
-> vouloir + [infinitif]
Also, as Maarten explained "vouloir que" is followed by Le Subjonctif. The links in Maarten's answer are very good and worth a look.
I hope this is helpful.
Bonne journée !

Answer

Nengi

the expression ‘ vouloir que ‘ requires the subjunctive form to follow in the relative clause.

The subjunctive mood and its use is a big topic in its own right and there will be plenty of material ahead on it. It is worth familiarising as you go, but I wouldn’t head off and try to learn all the subjunctive rules and required use cases - vouloir que and il faut que are 2 very common French expressions that always require the subjunctive, and it is worth becoming familiar with them relatively early on. There are many others to acquire as you encounter them too.

Some useful starting links below :

Vouloir que + the subjunctive mood (Le Subjonctif) = To want someone to do something in French

Il faut que + the subjunctive mood (Le Subjonctif) in French

https://www.lawlessfrench.com/grammar/subjunctive/