Bonjour
FUTURE PERFECT
> will have +participe passé
FUTURE CONTINUOUS
> will be + V-ing
By 2050, I don't think people will have travelled to Mars.
However, I think they will have settled in Space. Some people will be living in space stations, because the Earth will be too crowded.
I think scientists will have built huge farm in space in special glass buildings, and they will be developping a very healthy diet for people.
People will be eating specially developed fruit and vegetables.
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Bonne journée