I must go back (home)
je dois ... means I have to ..., I must ....
Je dois partir in French means "I must go" or "I have to leave" in English.
Que dois-je faire? in French means "What must I do?" in English.
je dois mon thé is the phrase. This means that I have my tea.
"Je dois m'en aller maintenant / je dois y aller" means 'I have to go now' in French.
je dois means i have
"finalement je rentre à la maison" (you took the decision after much dithering / hesitating) "je rentre enfin à la maison" (you would have gone home earlier but it wasn't possible)
i have is: je dois
je dois y aller, je dois m'en aller
"je dois" I have to leave = je dois m'en aller I have to work harder = je dois travailler plus dur
il faut que je .... or je dois ..
"es-tu" means "are you" in French or Spanish, "'(je) dois" means "(I) must" in French but does not mean anything in Spanish. Altogether is means nothing that makes sense.