Ahmed55 posted:

By 2050,people ..... all the oil in the world and they will need other fuels

Hi, Ahmed55,

Please ask your question in the text of your opening post. Do not leave us to infer your question from the title of your thread, as you have done here.

Here it would be natural to use the future perfect ("will have used") with the particle "up." When we have used something up, none of it is left.

(a) By 2050, people will have used up all the oil in the world, and they will need other fuels.

Along with the change to the phrasal verb "use up," it would be fitting to change to the passive voice in each independent clause. "People" is a generic subject.

(b) By 2050, all the oil in the world will have been used up, and other fuels will be needed.

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