"The glass is used for drinking."
Translation:Le verre sert à boire.
Well it's not the indicative of the present tense. "le verre utilise" can be translated as "the glass is used/is using". However we want to say it is "being used". This is known as the passive voice. So "est utilisé" is what you should use if you want to go with utiliser as we can translate this as "is utilised/used"