"I have to" is an English equivalent of the French phrase Je dois. The declarative statement also translates as "I must," "I need" or "I owe" according to English contexts. The pronunciation will be "zhuh dwa" in French.
Que dois-je faire? in French means "What must I do?" in English.
Je dois partir in French means "I must go" or "I have to leave" in English.
je dois ... means I have to ..., I must ....
to have to is usually translated 'devoir' in French. Ex. I have to leave > je dois m'en aller.
"I prefer to..." in English is Je préfère... in French.
Je suis... in French is "I am..." in English.
i have is: je dois
"Can I ...?" in English is Puis-je ...? in French.
"(I) am" in English is (Je) suis in French.
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
Je travaille! in French is "I'm working!" in English.