Je veux que tu parles plus doucement.

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Breakdown of Je veux que tu parles plus doucement.

• tu: you
• parler: to speak
• que: that

Questions & Answers about Je veux que tu parles plus doucement.

Why is it je veux que tu parles and not je veux tu parles?

Because French normally needs que to introduce a new clause after vouloir when there is a different subject.

• Je veux parler = I want to speak.
  Same subject: I want, and I speak, so French uses the infinitive.

• Je veux que tu parles = I want you to speak.
  Different subject: I want, but you speak, so French uses que + a conjugated verb.

So que is not optional here.

Why is parles used instead of parler?

Because after je veux que, the verb must be conjugated, not left in the infinitive.

Here, parles is the form used with tu in a clause introduced by que after a verb of wanting. French does not say je veux que tu parler.

Compare:

• Je veux parler = I want to speak.
• Je veux que tu parles = I want you to speak.

So parler would be wrong here because tu needs a finite verb.

Is parles a subjunctive form here?

Yes. After , French normally uses the , because it expresses a wish, desire, or will.